#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 /*<<< orphan*/ scanf(char *, int *);
int main(void) {
  int d, d1, d2, d3;
  printf("Enter a three digit number: ");
  scanf("%d", &d);
  d1 = d / 100;
  d2 = (d % 100) / 10;
  d3 = (d % 100) % 10;
  printf("The reversal is: %d%d%d", d3, d2, d1);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeee(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    $0x64,%ecx
cltd
idiv   %ecx
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    $0x64,%ecx
cltd
idiv   %ecx
mov    %edx,%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0x64,%ecx
cltd
idiv   %ecx
mov    %edx,%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0x14(%rbp)
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%edx
mov    -0xc(%rbp),%ecx
lea    0xe82(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xed8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xefc(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
movslq 0x4(%rsp),%rax
imul   $0x51eb851f,%rax,%rcx
mov    %rcx,%rdx
shr    $0x3f,%rdx
sar    $0x25,%rcx
add    %edx,%ecx
imul   $0x64,%ecx,%edx
sub    %edx,%eax
movsbl %al,%edx
imul   $0x67,%edx,%edx
movzwl %dx,%edx
movswl %dx,%esi
shr    $0xf,%edx
shr    $0xa,%esi
add    %dl,%sil
movsbl %sil,%edx
movzbl %dl,%esi
add    %esi,%esi
lea    (%rsi,%rsi,4),%esi
sub    %sil,%al
movsbl %al,%esi
lea    0xe91(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [29 x i8] c"Enter a three digit number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [24 x i8] c"The reversal is: %d%d%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
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%8 = load i32, i32* %2
%9 = sdiv i32 %8, 100
store i32 %9, i32* %3
%10 = load i32, i32* %2
%11 = srem i32 %10, 100
%12 = sdiv i32 %11, 10
store i32 %12, i32* %4
%13 = load i32, i32* %2
%14 = srem i32 %13, 100
%15 = srem i32 %14, 10
store i32 %15, i32* %5
%16 = load i32, i32* %5
%17 = load i32, i32* %4
%18 = load i32, i32* %3
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0), i32 %16, i32 %17, i32 %18)
ret i32 0
}

LLVM IR (-O2):
@.str = [29 x i8] c"Enter a three digit number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [24 x i8] c"The reversal is: %d%d%d\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 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 = sdiv i32 %5, 100
%7 = srem i32 %5, 100
%8 = trunc i32 %7 to i8
%9 = sdiv i8 %8, 10
%10 = sext i8 %9 to i32
%11 = srem i8 %8, 10
%12 = sext i8 %11 to i32
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.2, i64 0, i64 0), i32 %12, i32 %10, i32 %6)
ret i32 0
}