#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 *);
main() {
  int a, sum = 0, r;
  printf("Enter the number");
  scanf("%d", &a);
  for (a; a > 0;) {
    r = a % 10;
    sum = sum + r;
    a = a / 10;
  }
  printf("%d", sum);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xec6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x8(%rbp)
jle    1188 <main+0x68>
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %edx,-0x10(%rbp)
mov    -0xc(%rbp),%eax
add    -0x10(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
jmp    1154 <main+0x34>
mov    -0xc(%rbp),%esi
lea    0xe7f(%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   %rbx
sub    $0x10,%rsp
lea    0xed4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed5(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
jle    1181 <main+0x61>
xor    %ebx,%ebx
mov    $0xcccccccd,%ecx
cs nopw 0x0(%rax,%rax,1)
nop
mov    %eax,%edx
mov    %eax,%eax
imul   %rcx,%rax
shr    $0x23,%rax
lea    (%rax,%rax,1),%esi
lea    (%rsi,%rsi,4),%esi
mov    %edx,%edi
sub    %esi,%edi
add    %edi,%ebx
cmp    $0x9,%edx
ja     1160 <main+0x40>
mov    %eax,0xc(%rsp)
lea    0xe89(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

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

LLVM IR (-O2):
@.str = [17 x i8] c"Enter the number\00"
@.str.1 = [3 x i8] c"%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 ([17 x i8], [17 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 sgt i32 %5, 0
br i1 %6, label %7, label %15
7: ; preds = %0, %7
%8 = phi i32 [ %11, %7 ], [ 0, %0 ]
%9 = phi i32 [ %12, %7 ], [ %5, %0 ]
%10 = urem i32 %9, 10
%11 = add nuw nsw i32 %8, %10
%12 = udiv i32 %9, 10
%13 = icmp ult i32 %9, 10
br i1 %13, label %14, label %7
14: ; preds = %7
store i32 %12, i32* %1
br label %15
15: ; preds = %14, %0
%16 = phi i32 [ %11, %14 ], [ 0, %0 ]
%17 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %16)
ret i32 0
}