WeixiangYan/CodeTransOcean huggingface dataset:
Task: File size

C: #include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen(filename, "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}

int main(void)
{
  printf("%ld\n", getFileSize("input.txt"));
  printf("%ld\n", getFileSize("/input.txt"));
  return 0;
}








VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}



Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}




Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}






Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size



C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}





Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size



C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}






VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size




Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}


Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}
Task: File size





Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}




VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size




Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}




Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size

C: #include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen(filename, "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}

int main(void)
{
  printf("%ld\n", getFileSize("input.txt"));
  printf("%ld\n", getFileSize("/input.txt"));
  return 0;
}





Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}
Task: File size

C: #include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen(filename, "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}

int main(void)
{
  printf("%ld\n", getFileSize("input.txt"));
  printf("%ld\n", getFileSize("/input.txt"));
  return 0;
}







Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}


C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}







VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size



C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}



Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}
Task: File size





Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}



Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size




Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}





VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size



C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}


Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}
Task: File size







Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')


VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: File size

C: #include <stdlib.h>
#include <stdio.h>

long getFileSize(const char *filename)
{
  long result;
  FILE *fh = fopen(filename, "rb");
  fseek(fh, 0, SEEK_END);
  result = ftell(fh);
  fclose(fh);
  return result;
}

int main(void)
{
  printf("%ld\n", getFileSize("input.txt"));
  printf("%ld\n", getFileSize("/input.txt"));
  return 0;
}






PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
Task: File size



C#: using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(new FileInfo("/input.txt").Length);
        Console.WriteLine(new FileInfo("input.txt").Length);
    }
}




PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
Task: File size


C++: #include <iostream>
#include <fstream>

std::ios::off_type getFileSize(const char *filename) {
  std::ifstream f(filename);
  std::ios::pos_type begin = f.tellg();
  f.seekg(0, std::ios::end);
  std::ios::pos_type end = f.tellg();
  return end - begin;
}

int main() {
  std::cout << getFileSize("input.txt") << std::endl;
  std::cout << getFileSize("/input.txt") << std::endl;
  return 0;
}





PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
Task: File size




Go: package main

import "fmt"
import "os"

func printFileSize(f string) {
    if stat, err := os.Stat(f); err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(stat.Size())
    }
}

func main() {
    printFileSize("input.txt")
    printFileSize("/input.txt")
}



PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
Task: File size





Java: import java.io.File;

public class FileSize
{
    public static void main ( String[] args )
    {
        System.out.println("input.txt  : " + new File("input.txt").length() + " bytes");
        System.out.println("/input.txt : " + new File("/input.txt").length() + " bytes");
    }
}


PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>
Task: File size






PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>


Python: import os

size = os.path.getsize('input.txt')
size = os.path.getsize('/input.txt')
Task: File size






PHP: <?php
echo filesize('input.txt'), "\n";
echo filesize('/input.txt'), "\n";
?>



VB: Option Explicit

----

Sub DisplayFileSize(ByVal Path As String, ByVal Filename As String)
Dim i As Long
  If InStr(Len(Path), Path, "\") = 0 Then
    Path = Path & "\"
  End If
  On Error Resume Next 
  i = FileLen(Path & Filename)
  If Err.Number = 0 Then
    Debug.Print "file size: " & CStr(i) & " Bytes"
  Else
    Debug.Print "error: " & Err.Description
  End If
End Sub

----

Sub Main()
  DisplayFileSize CurDir(), "input.txt"
  DisplayFileSize CurDir(), "innputt.txt"
  DisplayFileSize Environ$("SystemRoot"), "input.txt"
End Sub
Task: Truncatable primes

C: #include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PRIME 1000000
char *primes;
int n_primes;


void init_primes()
{
	int j;
	primes = malloc(sizeof(char) * MAX_PRIME);
	memset(primes, 1, MAX_PRIME);
	primes[0] = primes[1] = 0;
	int i = 2;
	while (i * i < MAX_PRIME) {
		for (j = i * 2; j < MAX_PRIME; j += i)
			primes[j] = 0;
		while (++i < MAX_PRIME && !primes[i]);
	}
}

int left_trunc(int n)
{
	int tens = 1;
	while (tens < n) tens *= 10;

	while (n) {
		if (!primes[n]) return 0;
		tens /= 10;
		if (n < tens) return 0;
		n %= tens;
	}
	return 1;
}

int right_trunc(int n)
{
	while (n) {
		if (!primes[n]) return 0;
		n /= 10;
	}
	return 1;
}

int main()
{
	int n;
	int max_left = 0, max_right = 0;
	init_primes();

	for (n = MAX_PRIME - 1; !max_left;  n -= 2)
		if (left_trunc(n)) max_left = n;

	for (n = MAX_PRIME - 1; !max_right; n -= 2)
		if (right_trunc(n)) max_right = n;

	printf("Left: %d; right: %d\n", max_left, max_right);
	return 0;
}



C#: using System;  
using System.Collections.Generic;
class truncatable_primes
{
    static void Main()
    {
        uint m = 1000000;
        Console.Write("L " + L(m) + " R " + R(m) + "  ");
        var sw = System.Diagnostics.Stopwatch.StartNew();
        for (int i = 1000; i > 0; i--) { L(m); R(m); }
        Console.Write(sw.Elapsed); Console.Read();
    }

    static uint L(uint n)
    {
        n -= n & 1; n--;
        for (uint d, d1 = 100; ; n -= 2)
        {
            while (n % 3 == 0 || n % 5 == 0 || n % 7 == 0) n -= 2;
            if ((d = n % 10) == 3 || d == 7)
            {
                while (d1 < n && d < (d = n % d1) && isP(d)) d1 *= 10;
                if (d1 > n && isP(n)) return n; d1 = 100;
            }
        }
    }

    static uint R(uint m)
    {
        var p = new List<uint>() { 2, 3, 5, 7 }; uint n = 20, np;
        for (int i = 1; i < p.Count; n = 10 * p[i++])
        {
            if ((np = n + 1) >= m) break; if (isP(np)) p.Add(np);
            if ((np = n + 3) >= m) break; if (isP(np)) p.Add(np);
            if ((np = n + 7) >= m) break; if (isP(np)) p.Add(np);
            if ((np = n + 9) >= m) break; if (isP(np)) p.Add(np);
        }
        return p[p.Count - 1];
    }

    static bool isP(uint n)
    {
        if (n < 7) return n == 2 || n == 3 || n == 5;
        if ((n & 1) == 0 || n % 3 == 0 || n % 5 == 0) return false;
        for (uint r = (uint)Math.Sqrt(n), d = 7; d <= r; d += 30)
            if (n % (d + 00) == 0 || n % (d + 04) == 0 ||
                n % (d + 06) == 0 || n % (d + 10) == 0 ||
                n % (d + 12) == 0 || n % (d + 16) == 0 ||
                n % (d + 22) == 0 || n % (d + 24) == 0) return false;
        return true;
    }
}
Task: Truncatable primes

C: #include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PRIME 1000000
char *primes;
int n_primes;


void init_primes()
{
	int j;
	primes = malloc(sizeof(char) * MAX_PRIME);
	memset(primes, 1, MAX_PRIME);
	primes[0] = primes[1] = 0;
	int i = 2;
	while (i * i < MAX_PRIME) {
		for (j = i * 2; j < MAX_PRIME; j += i)
			primes[j] = 0;
		while (++i < MAX_PRIME && !primes[i]);
	}
}

int left_trunc(int n)
{
	int tens = 1;
	while (tens < n) tens *= 10;

	while (n) {
		if (!primes[n]) return 0;
		tens /= 10;
		if (n < tens) return 0;
		n %= tens;
	}
	return 1;
}

int right_trunc(int n)
{
	while (n) {
		if (!primes[n]) return 0;
		n /= 10;
	}
	return 1;
}

int main()
{
	int n;
	int max_left = 0, max_right = 0;
	init_primes();

	for (n = MAX_PRIME - 1; !max_left;  n -= 2)
		if (left_trunc(n)) max_left = n;

	for (n = MAX_PRIME - 1; !max_right; n -= 2)
		if (right_trunc(n)) max_right = n;

	printf("Left: %d; right: %d\n", max_left, max_right);
	return 0;
}


C++: #include <iostream>
#include "prime_sieve.hpp"

bool is_left_truncatable(const prime_sieve& sieve, int p) {
    for (int n = 10, q = p; p > n; n *= 10) {
        if (!sieve.is_prime(p % n) || q == p % n)
            return false;
        q = p % n;
    }
    return true;
}

bool is_right_truncatable(const prime_sieve& sieve, int p) {
    for (int q = p/10; q > 0; q /= 10) {
        if (!sieve.is_prime(q))
            return false;
    }
    return true;
}

int main() {
    const int limit = 1000000;

    
    prime_sieve sieve(limit + 1);

    int largest_left = 0;
    int largest_right = 0;
    
    for (int p = limit; p >= 2; --p) {
        if (sieve.is_prime(p) && is_left_truncatable(sieve, p)) {
            largest_left = p;
            break;
        }
    }
    
    for (int p = limit; p >= 2; --p) {
        if (sieve.is_prime(p) && is_right_truncatable(sieve, p)) {
            largest_right = p;
            break;
        }
    }
    
    std::cout << "Largest left truncatable prime is " << largest_left << '\n';
    std::cout << "Largest right truncatable prime is " << largest_right << '\n';
    return 0;
}
Task: Truncatable primes

C: #include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PRIME 1000000
char *primes;
int n_primes;


void init_primes()
{
	int j;
	primes = malloc(sizeof(char) * MAX_PRIME);
	memset(primes, 1, MAX_PRIME);
	primes[0] = primes[1] = 0;
	int i = 2;
	while (i * i < MAX_PRIME) {
		for (j = i * 2; j < MAX_PRIME; j += i)
			primes[j] = 0;
		while (++i < MAX_PRIME && !primes[i]);
	}
}

int left_trunc(int n)
{
	int tens = 1;
	while (tens < n) tens *= 10;

	while (n) {
		if (!primes[n]) return 0;
		tens /= 10;
		if (n < tens) return 0;
		n %= tens;
	}
	return 1;
}

int right_trunc(int n)
{
	while (n) {
		if (!primes[n]) return 0;
		n /= 10;
	}
	return 1;
}

int main()
{
	int n;
	int max_left = 0, max_right = 0;
	init_primes();

	for (n = MAX_PRIME - 1; !max_left;  n -= 2)
		if (left_trunc(n)) max_left = n;

	for (n = MAX_PRIME - 1; !max_right; n -= 2)
		if (right_trunc(n)) max_right = n;

	printf("Left: %d; right: %d\n", max_left, max_right);
	return 0;
}




Go: package main

import "fmt"

func main() {
    sieve(1e6)
    if !search(6, 1e6, "left", func(n, pot int) int { return n % pot }) {
        panic("997?")
    }
    if !search(6, 1e6, "right", func(n, _ int) int { return n / 10 }) {
        panic("7393?")
    }
}

var c []bool

func sieve(ss int) {
    c = make([]bool, ss)
    c[1] = true
    for p := 2; ; {
        p2 := p * p
        if p2 >= ss {
            break
        }
        for i := p2; i < ss; i += p {
            c[i] = true
        }
        for {
            p++
            if !c[p] {
                break
            }
        }
    }
}

func search(digits, pot int, s string, truncFunc func(n, pot int) int) bool {
    n := pot - 1
    pot /= 10
smaller:
    for ; n >= pot; n -= 2 {
        for tn, tp := n, pot; tp > 0; tp /= 10 {
            if tn < tp || c[tn] {
                continue smaller
            }
            tn = truncFunc(tn, tp)
        }
        fmt.Println("max", s, "truncatable:", n)
        return true
    }
    if digits > 1 {
        return search(digits-1, pot, s, truncFunc)
    }
    return false
}
Task: Truncatable primes

C: #include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PRIME 1000000
char *primes;
int n_primes;


void init_primes()
{
	int j;
	primes = malloc(sizeof(char) * MAX_PRIME);
	memset(primes, 1, MAX_PRIME);
	primes[0] = primes[1] = 0;
	int i = 2;
	while (i * i < MAX_PRIME) {
		for (j = i * 2; j < MAX_PRIME; j += i)
			primes[j] = 0;
		while (++i < MAX_PRIME && !primes[i]);
	}
}

int left_trunc(int n)
{
	int tens = 1;
	while (tens < n) tens *= 10;

	while (n) {
		if (!primes[n]) return 0;
		tens /= 10;
		if (n < tens) return 0;
		n %= tens;
	}
	return 1;
}

int right_trunc(int n)
{
	while (n) {
		if (!primes[n]) return 0;
		n /= 10;
	}
	return 1;
}

int main()
{
	int n;
	int max_left = 0, max_right = 0;
	init_primes();

	for (n = MAX_PRIME - 1; !max_left;  n -= 2)
		if (left_trunc(n)) max_left = n;

	for (n = MAX_PRIME - 1; !max_right; n -= 2)
		if (right_trunc(n)) max_right = n;

	printf("Left: %d; right: %d\n", max_left, max_right);
	return 0;
}







Python: maxprime = 1000000

def primes(n):
    multiples = set()
    prime = []
    for i in range(2, n+1):
        if i not in multiples:
            prime.append(i)
            multiples.update(set(range(i*i, n+1, i)))
    return prime

def truncatableprime(n):
    'Return a longest left and right truncatable primes below n'
    primelist = [str(x) for x in primes(n)[::-1]]
    primeset = set(primelist)
    for n in primelist:
        
        alltruncs = set(n[i:] for i in range(len(n)))
        if alltruncs.issubset(primeset):
            truncateleft = int(n)
            break
    for n in primelist:
        
        alltruncs = set([n[:i+1] for i in range(len(n))])
        if alltruncs.issubset(primeset):
            truncateright = int(n)
            break
    return truncateleft, truncateright

print(truncatableprime(maxprime))