#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 */

/* Variables and functions */
int abs(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main(void) {
  int n, digit;
  printf("Enter an integer > ");
  scanf("%d", &n);
  while (n != 0) {
    digit = n % 10;
    n = n / 10;
    if ((digit < 0) && (n == 0))
      printf("%d\n", digit);
    else
      printf("%d\n", abs(digit));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xec0(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
cmpl   $0x0,-0x8(%rbp)
je     11ca <main+0x9a>
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
cmpl   $0x0,-0xc(%rbp)
jge    11ad <main+0x7d>
cmpl   $0x0,-0x8(%rbp)
jne    11ad <main+0x7d>
mov    -0xc(%rbp),%esi
lea    0xe76(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    11c5 <main+0x95>
mov    -0xc(%rbp),%edi
call   1030 <abs@plt>
mov    %eax,%esi
lea    0xe59(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    115d <main+0x2d>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xed4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xeda(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
je     11ad <main+0x8d>
lea    0xec4(%rip),%rbx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
cltq
imul   $0x66666667,%rax,%rcx
mov    %rcx,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rcx
add    %edx,%ecx
lea    (%rcx,%rcx,1),%edx
lea    (%rdx,%rdx,4),%edx
mov    %eax,%edi
sub    %edx,%edi
add    $0x9,%eax
mov    %edi,%edx
neg    %edx
cmovs  %edi,%edx
cmp    $0x13,%eax
mov    %edx,%esi
cmovb  %edi,%esi
mov    %ecx,0xc(%rsp)
test   %edi,%edi
cmovns %edx,%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
jne    1160 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [20 x i8] c"Enter an integer > \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
br label %6
6: ; preds = %26, %0
%7 = load i32, i32* %2
%8 = icmp ne i32 %7, 0
br i1 %8, label %9, label %27
9: ; preds = %6
%10 = load i32, i32* %2
%11 = srem i32 %10, 10
store i32 %11, i32* %3
%12 = load i32, i32* %2
%13 = sdiv i32 %12, 10
store i32 %13, i32* %2
%14 = load i32, i32* %3
%15 = icmp slt i32 %14, 0
br i1 %15, label %16, label %22
16: ; preds = %9
%17 = load i32, i32* %2
%18 = icmp eq i32 %17, 0
br i1 %18, label %19, label %22
19: ; preds = %16
%20 = load i32, i32* %3
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %20)
br label %26
22: ; preds = %16, %9
%23 = load i32, i32* %3
%24 = call i32 @abs(i32 %23)
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %24)
br label %26
26: ; preds = %22, %19
br label %6
27: ; preds = %6
ret i32 0
}

LLVM IR (-O2):
@.str = [20 x i8] c"Enter an integer > \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp eq i32 %5, 0
br i1 %6, label %20, label %7
7: ; preds = %0, %7
%8 = phi i32 [ %18, %7 ], [ %5, %0 ]
%9 = srem i32 %8, 10
%10 = sdiv i32 %8, 10
store i32 %10, i32* %1
%11 = icmp slt i32 %9, 0
%12 = add i32 %8, 9
%13 = icmp ult i32 %12, 19
%14 = and i1 %11, %13
%15 = call i32 @llvm.abs.i32(i32 %9, i1 true)
%16 = select i1 %14, i32 %9, i32 %15
%17 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %16)
%18 = load i32, i32* %1
%19 = icmp eq i32 %18, 0
br i1 %19, label %20, label %7
20: ; preds = %7, %0
ret i32 0
}