Task: Penney's game
C: #include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define SEQLEN 3

int getseq(char *s)
{
    int r = 0;
    int i = 1 << (SEQLEN - 1);

    while (*s && i) {
        switch (*s++) {
            case 'H':
            case 'h':
                r |= i;
                break;
            case 'T':
            case 't':
                
                break;
            default:
                return -1;
        }
        i >>= 1;
    }

    return r;
}

void printseq(int seq)
{
    int i;
    for (i = SEQLEN - 1; i >= 0; --i)
        printf("%c", seq & (1 << i) ? 'h' : 't');
}

int getuser(void)
{
    int user;
    char s[SEQLEN + 1];

    printf("Enter your sequence of %d (h/t): ", SEQLEN);
    while (1) {
        
        if (scanf("%3s", s) != 1) exit(1);
        if ((user = getseq(s)) != -1) return user;
        printf("Please enter only h/t characters: ");
    }
}

int getai(int user)
{
    int ai;

    printf("Computers sequence of %d is: ", SEQLEN);
    
    if (user == -1)
        ai = rand() & (1 << SEQLEN) - 1;
    else
        ai = (user >> 1) | ((~user << 1) & (1 << SEQLEN - 1));

    printseq(ai);
    printf("\n");
    return ai;
}

int rungame(int user, int ai)
{
    
    int last3 = rand() & (1 << SEQLEN) - 1;

    printf("Tossed sequence: ");
    printseq(last3);
    while (1) {
        if (user == last3) {
            printf("\nUser wins!\n");
            return 1;
        }

        if (ai == last3) {
            printf("\nAi wins!\n");
            return 0;
        }

        last3 = ((last3 << 1) & (1 << SEQLEN) - 2) | (rand() & 1);
        printf("%c", last3 & 1 ? 'h' : 't');
    }
}

int main(void)
{
    srand(time(NULL));
    int playerwins = 0;
    int totalgames = 0;

    
    while (1) {
        int user = -1;
        int ai   = -1;

        printf("\n");
        if (rand() & 1) {
            ai   = getai(user);
            user = getuser();
        }
        else {
            user = getuser();
            ai   = getai(user);
        }
        
        playerwins += rungame(user, ai);
        totalgames++;

        printf("You have won %d out of %d games\n", playerwins, totalgames);
        printf("=================================\n");
    }

    return 0;
}

Go: package main
import "fmt"
import "math/rand"
func main(){
var a1,a2,a3,y,match,j,k int
var inp string
y=1
for y==1{
fmt.Println("Enter your sequence:")
fmt.Scanln(&inp)
var Ai [3] int
var user [3] int
for j=0;j<3;j++{
if(inp[j]==104){
user[j]=1
}else{
user[j]=0
}
}
for k=0;k<3;k++{
Ai[k]=rand.Intn(2)
}
for user[0]==Ai[0]&&user[1]==Ai[1]&&user[2]==Ai[2]{
for k=0;k<3;k++{
Ai[k]=rand.Intn(2)
}
}
fmt.Println("You gave the sequence:")
printht(user)
fmt.Println()
fmt.Println("The computer generated sequence is:")
printht(Ai)
fmt.Println()
a1=rand.Intn(2)
a2=rand.Intn(2)
a3=rand.Intn(2)
fmt.Print("The generated sequence is:")
printh(a1)
printh(a2)
printh(a3)
match=0
for match==0{
if(matches(user,a1,a2,a3)==1){
fmt.Println()
fmt.Println("You have won!!!")
match=1
}else if(matches(Ai,a1,a2,a3)==1){
fmt.Println()
fmt.Println("You lost!! Computer wins")
match=1
}else{
a1=a2
a2=a3
a3=rand.Intn(2)
printh(a3)
}
}
fmt.Println("Do you want to continue(0/1):")
fmt.Scanln(&y)
}
}
func printht(a [3] int) int{
var i int
for i=0;i<3;i++{
if(a[i]==1){
fmt.Print("h")
}else{
fmt.Print("t")
}
}
return 1
}
func printh(a int) int{
if(a==1){
fmt.Print("h")
}else{
fmt.Print("t")
}
return 1
}
func matches(a [3] int,p int,q int,r int) int{
if(a[0]==p&&a[1]==q&&a[2]==r){
return 1
}else{
return 0
}
}