#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
scalar_t__ EOF;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, int, int, char *);
scalar_t__ fscanf(int /*<<< orphan*/ *, char *, int *, int *);
int /*<<< orphan*/ itoa(int, char *, int);
int /*<<< orphan*/ perror(char *);
int main(int argc, char *argv[]) {
  FILE *in, *out;
  in = fopen("input.dat", "r");
  if (in == NULL) {
    perror("input.dat");
    return 1;
  }
  out = fopen("output.dat", "w");
  if (out == NULL) {
    perror("output.dat");
    return 1;
  }
  int n, w;
  char s[128];
  while (fscanf(in, "%d %d", &n, &w) != EOF) {
    itoa(n, s, w);
    fprintf(out, "itoa(%d, %d) is '%s'\n", n, w, s);
  }
  fclose(in);
  fclose(out);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xb0,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xe80(%rip),%rdi
lea    0xe83(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11b3 <main+0x53>
lea    0xe5e(%rip),%rdi
call   1070 <perror@plt>
movl   $0x1,-0x4(%rbp)
jmp    1267 <main+0x107>
lea    0xe52(%rip),%rdi
lea    0xe56(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    11ed <main+0x8d>
lea    0xe30(%rip),%rdi
call   1070 <perror@plt>
movl   $0x1,-0x4(%rbp)
jmp    1267 <main+0x107>
jmp    11f2 <main+0x92>
mov    -0x18(%rbp),%rdi
lea    0xe1c(%rip),%rsi
lea    -0x24(%rbp),%rdx
lea    -0x28(%rbp),%rcx
call   1040 <fscanf@plt>
mov    0x2dd7(%rip),%rcx
cmp    (%rcx),%rax
je     124e <main+0xee>
mov    -0x24(%rbp),%edi
lea    -0xb0(%rbp),%rsi
mov    -0x28(%rbp),%edx
call   1080 <itoa@plt>
mov    -0x20(%rbp),%rdi
mov    -0x24(%rbp),%edx
mov    -0x28(%rbp),%ecx
lea    -0xb0(%rbp),%r8
lea    0xddb(%rip),%rsi
call   1050 <fprintf@plt>
jmp    11f2 <main+0x92>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
mov    -0x20(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0xb0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x98,%rsp
lea    0xe88(%rip),%rdi
lea    0xe8b(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1259 <main+0xf9>
mov    %rax,%r14
lea    0xe75(%rip),%rdi
lea    0xe79(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1262 <main+0x102>
mov    %rax,%r15
lea    0xe63(%rip),%rsi
lea    0xc(%rsp),%rdx
lea    0x8(%rsp),%rcx
mov    %r14,%rdi
call   1040 <fscanf@plt>
mov    0x2e19(%rip),%r13
cmp    0x0(%r13),%rax
je     1235 <main+0xd5>
lea    0x10(%rsp),%rbx
lea    0xc(%rsp),%rbp
lea    0x8(%rsp),%r12
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    0xc(%rsp),%edi
mov    0x8(%rsp),%edx
mov    %rbx,%rsi
call   1080 <itoa@plt>
mov    0xc(%rsp),%edx
mov    0x8(%rsp),%ecx
mov    %r15,%rdi
lea    0xe0d(%rip),%rsi
mov    %rbx,%r8
call   1050 <fprintf@plt>
mov    %r14,%rdi
lea    0xdf5(%rip),%rsi
mov    %rbp,%rdx
mov    %r12,%rcx
call   1040 <fscanf@plt>
cmp    0x0(%r13),%rax
jne    11f0 <main+0x90>
mov    %r14,%rdi
call   1030 <fclose@plt>
mov    %r15,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x98,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret
lea    0xda0(%rip),%rdi
jmp    1269 <main+0x109>
lea    0xda3(%rip),%rdi
call   1070 <perror@plt>
mov    $0x1,%eax
jmp    1247 <main+0xe7>

LLVM IR (-O0):
@.str = [10 x i8] c"input.dat\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [11 x i8] c"output.dat\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [6 x i8] c"%d %d\00"
@EOF = global i64 0
@.str.5 = [22 x i8] c"itoa(%d, %d) is '%s'\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32*
%7 = alloca i32*
%8 = alloca i32
%9 = alloca i32
%10 = alloca [128 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%11 = call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %11, i32** %6
%12 = load i32*, i32** %6
%13 = icmp eq i32* %12, null
br i1 %13, label %14, label %16
14: ; preds = %2
%15 = call i32 @perror(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
store i32 1, i32* %3
br label %43
16: ; preds = %2
%17 = call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
store i32* %17, i32** %7
%18 = load i32*, i32** %7
%19 = icmp eq i32* %18, null
br i1 %19, label %20, label %22
20: ; preds = %16
%21 = call i32 @perror(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0))
store i32 1, i32* %3
br label %43
22: ; preds = %16
br label %23
23: ; preds = %28, %22
%24 = load i32*, i32** %6
%25 = call i64 @fscanf(i32* %24, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i32* %8, i32* %9)
%26 = load i64, i64* @EOF
%27 = icmp ne i64 %25, %26
br i1 %27, label %28, label %38
28: ; preds = %23
%29 = load i32, i32* %8
%30 = getelementptr inbounds [128 x i8], [128 x i8]* %10, i64 0, i64 0
%31 = load i32, i32* %9
%32 = call i32 @itoa(i32 %29, i8* %30, i32 %31)
%33 = load i32*, i32** %7
%34 = load i32, i32* %8
%35 = load i32, i32* %9
%36 = getelementptr inbounds [128 x i8], [128 x i8]* %10, i64 0, i64 0
%37 = call i32 @fprintf(i32* %33, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.5, i64 0, i64 0), i32 %34, i32 %35, i8* %36)
br label %23
38: ; preds = %23
%39 = load i32*, i32** %6
%40 = call i32 @fclose(i32* %39)
%41 = load i32*, i32** %7
%42 = call i32 @fclose(i32* %41)
store i32 0, i32* %3
br label %43
43: ; preds = %38, %20, %14
%44 = load i32, i32* %3
ret i32 %44
}

LLVM IR (-O2):
@.str = [10 x i8] c"input.dat\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [11 x i8] c"output.dat\00"
@.str.3 = [2 x i8] c"w\00"
@.str.4 = [6 x i8] c"%d %d\00"
@EOF = global i64 0
@.str.5 = [22 x i8] c"itoa(%d, %d) is '%s'\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca [128 x i8]
%6 = tail call i32* @fopen(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%7 = icmp eq i32* %6, null
br i1 %7, label %8, label %10
8: ; preds = %2
%9 = tail call i32 @perror(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str, i64 0, i64 0))
br label %35
10: ; preds = %2
%11 = tail call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i32* %11, null
br i1 %12, label %13, label %15
13: ; preds = %10
%14 = tail call i32 @perror(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0))
br label %35
15: ; preds = %10
%16 = bitcast i32* %3 to i8*
%17 = bitcast i32* %4 to i8*
%18 = getelementptr inbounds [128 x i8], [128 x i8]* %5, i64 0, i64 0
%19 = call i64 @fscanf(i32* %6, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i32* %3, i32* %4)
%20 = load i64, i64* @EOF
%21 = icmp eq i64 %19, %20
br i1 %21, label %32, label %22
22: ; preds = %15, %22
%23 = load i32, i32* %3
%24 = load i32, i32* %4
%25 = call i32 @itoa(i32 %23, i8* %18, i32 %24)
%26 = load i32, i32* %3
%27 = load i32, i32* %4
%28 = call i32 @fprintf(i32* %11, i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.5, i64 0, i64 0), i32 %26, i32 %27, i8* %18)
%29 = call i64 @fscanf(i32* %6, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i32* %3, i32* %4)
%30 = load i64, i64* @EOF
%31 = icmp eq i64 %29, %30
br i1 %31, label %32, label %22
32: ; preds = %22, %15
%33 = call i32 @fclose(i32* %6)
%34 = call i32 @fclose(i32* %11)
br label %35
35: ; preds = %32, %13, %8
%36 = phi i32 [ 1, %8 ], [ 1, %13 ], [ 0, %32 ]
ret i32 %36
}