#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 u, temp, result;
  printf("Please enter an integer.\n");
  scanf("%i", &u);
  result = 0;
  while (u % 10 != 0) {
    temp = u % 10;
    result += temp;
    u /= 10;
  }
  printf("%i", result);
  printf("\n");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x0,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
cmp    $0x0,%edx
je     1192 <main+0x72>
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    -0x10(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
jmp    1154 <main+0x34>
mov    -0x10(%rbp),%esi
lea    0xe7e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe6e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xebb(%rip),%rdi
call   1040 <puts@plt>
lea    0xeac(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1060 <scanf@plt>
movslq 0x4(%rsp),%rax
imul   $0x66666667,%rax,%rcx
mov    %rcx,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rcx
add    %edx,%ecx
add    %ecx,%ecx
lea    (%rcx,%rcx,4),%edx
mov    %eax,%ecx
xor    %esi,%esi
sub    %edx,%ecx
je     11cc <main+0x8c>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
add    %ecx,%esi
cltq
imul   $0x66666667,%rax,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x22,%rax
add    %ecx,%eax
movslq %eax,%rcx
imul   $0x66666667,%rcx,%rdx
mov    %rdx,%rdi
shr    $0x3f,%rdi
sar    $0x22,%rdx
add    %edi,%edx
add    %edx,%edx
lea    (%rdx,%rdx,4),%edx
sub    %edx,%ecx
jne    1190 <main+0x50>
mov    %eax,0x4(%rsp)
lea    0xe2d(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
pop    %rcx
ret

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

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%i\00"
@str = [25 x i8] c"Please enter an integer.\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 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 = srem i32 %5, 10
%7 = icmp eq i32 %6, 0
br i1 %7, label %17, label %8
8: ; preds = %0, %8
%9 = phi i32 [ %14, %8 ], [ %6, %0 ]
%10 = phi i32 [ %12, %8 ], [ 0, %0 ]
%11 = phi i32 [ %13, %8 ], [ %5, %0 ]
%12 = add nsw i32 %9, %10
%13 = sdiv i32 %11, 10
%14 = srem i32 %13, 10
%15 = icmp eq i32 %14, 0
br i1 %15, label %16, label %8
16: ; preds = %8
store i32 %13, i32* %1
br label %17
17: ; preds = %16, %0
%18 = phi i32 [ %12, %16 ], [ 0, %0 ]
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %18)
%20 = call i32 @putchar(i32 10)
ret i32 0
}