#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 /*<<< orphan*/ printf(char *, int, int);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int a, b, c = 0, e;
  scanf("%d", &a);
  e = a;
  while (a) {
    b = a % 10;
    c = c * 10 + b;
    a = a / 10;
  }
  printf("Reverse of %d is %d", e, c);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x10(%rbp)
lea    0xed4(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x8(%rbp)
je     1181 <main+0x61>
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0xc(%rbp)
imul   $0xa,-0x10(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
jmp    114c <main+0x2c>
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%edx
lea    0xe72(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee9(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
mov    0x4(%rsp),%esi
xor    %edx,%edx
test   %esi,%esi
je     1175 <main+0x55>
mov    %esi,%eax
xchg   %ax,%ax
lea    (%rdx,%rdx,4),%r8d
movslq %eax,%rcx
imul   $0x66666667,%rcx,%rax
mov    %rax,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rax
add    %edx,%eax
lea    (%rax,%rax,1),%edx
lea    (%rdx,%rdx,4),%edx
mov    %ecx,%edi
sub    %edx,%edi
lea    (%rdi,%r8,2),%edx
add    $0x9,%ecx
cmp    $0x12,%ecx
ja     1140 <main+0x20>
mov    %eax,0x4(%rsp)
lea    0xe84(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [20 x i8] c"Reverse of %d is %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %4
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%7 = load i32, i32* %2
store i32 %7, i32* %5
br label %8
8: ; preds = %11, %0
%9 = load i32, i32* %2
%10 = icmp ne i32 %9, 0
br i1 %10, label %11, label %20
11: ; preds = %8
%12 = load i32, i32* %2
%13 = srem i32 %12, 10
store i32 %13, i32* %3
%14 = load i32, i32* %4
%15 = mul nsw i32 %14, 10
%16 = load i32, i32* %3
%17 = add nsw i32 %15, %16
store i32 %17, i32* %4
%18 = load i32, i32* %2
%19 = sdiv i32 %18, 10
store i32 %19, i32* %2
br label %8
20: ; preds = %8
%21 = load i32, i32* %5
%22 = load i32, i32* %4
%23 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0), i32 %21, i32 %22)
ret i32 0
}

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