#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 n, sum = 0, num, d;
  printf("Enter any integer to find sum it\'s digits: ");
  scanf("%d", &n);
  num = n;
  while (n != 0) {
    d = n % 10;
    sum += d;
    n = n / 10;
  }
  printf("\nThe sum of %d\'s digits is %d", num, sum);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xefc(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x10(%rbp)
cmpl   $0x0,-0x8(%rbp)
je     118e <main+0x6e>
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0x14(%rbp)
mov    -0x14(%rbp),%eax
add    -0xc(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
jmp    115a <main+0x3a>
mov    -0x10(%rbp),%esi
mov    -0xc(%rbp),%edx
lea    0xe91(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xed4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf0b(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%esi
test   %esi,%esi
je     118f <main+0x6f>
xor    %ebx,%ebx
mov    %esi,%eax
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
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
add    %edi,%ebx
add    $0x9,%ecx
cmp    $0x12,%ecx
ja     1160 <main+0x40>
mov    %eax,0xc(%rsp)
lea    0xe96(%rip),%rdi
mov    %ebx,%edx
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [44 x i8] c"Enter any integer to find sum it's digits: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [30 x i8] c"\0AThe sum of %d's digits 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* %3
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([44 x i8], [44 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
store i32 %8, i32* %4
br label %9
9: ; preds = %12, %0
%10 = load i32, i32* %2
%11 = icmp ne i32 %10, 0
br i1 %11, label %12, label %20
12: ; preds = %9
%13 = load i32, i32* %2
%14 = srem i32 %13, 10
store i32 %14, i32* %5
%15 = load i32, i32* %5
%16 = load i32, i32* %3
%17 = add nsw i32 %16, %15
store i32 %17, i32* %3
%18 = load i32, i32* %2
%19 = sdiv i32 %18, 10
store i32 %19, i32* %2
br label %9
20: ; preds = %9
%21 = load i32, i32* %4
%22 = load i32, i32* %3
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.2, i64 0, i64 0), i32 %21, i32 %22)
ret i32 0
}

LLVM IR (-O2):
@.str = [44 x i8] c"Enter any integer to find sum it's digits: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [30 x i8] c"\0AThe sum of %d's digits is %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 ([44 x i8], [44 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 %16, label %7
7: ; preds = %0, %7
%8 = phi i32 [ %11, %7 ], [ 0, %0 ]
%9 = phi i32 [ %12, %7 ], [ %5, %0 ]
%10 = srem i32 %9, 10
%11 = add nsw i32 %8, %10
%12 = sdiv i32 %9, 10
%13 = add i32 %9, 9
%14 = icmp ult i32 %13, 19
br i1 %14, label %15, label %7
15: ; preds = %7
store i32 %12, i32* %1
br label %16
16: ; preds = %15, %0
%17 = phi i32 [ %11, %15 ], [ 0, %0 ]
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 x i8]* @.str.2, i64 0, i64 0), i32 %5, i32 %17)
ret i32 0
}