#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 /*<<< orphan*/ scanf(char *, int *);
int main() {
  int ans = 0;
  scanf("%d", &ans);
  while (ans != 0) {
    ans %= 9;
    printf("%d\n", (ans == 0) ? 9 : ans);
    scanf("%d", &ans);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
lea    0xec3(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x8(%rbp)
je     119f <main+0x7f>
mov    -0x8(%rbp),%eax
mov    $0x9,%ecx
cltd
idiv   %ecx
mov    %edx,-0x8(%rbp)
cmpl   $0x0,-0x8(%rbp)
jne    1175 <main+0x55>
mov    $0x9,%eax
mov    %eax,-0xc(%rbp)
jmp    117b <main+0x5b>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%esi
lea    0xe7e(%rip),%rdi
call   1030 <printf@plt>
lea    0xe6f(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
jmp    1146 <main+0x26>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
movl   $0x0,0x4(%rsp)
lea    0xeca(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
mov    0x4(%rsp),%eax
test   %eax,%eax
je     119e <main+0x7e>
mov    $0x9,%ebp
lea    0xeaf(%rip),%r14
lea    0xea5(%rip),%r15
lea    0x4(%rsp),%rbx
movslq %eax,%rsi
imul   $0x38e38e39,%rsi,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x21,%rax
add    %ecx,%eax
lea    (%rax,%rax,8),%eax
sub    %eax,%esi
mov    %esi,0x4(%rsp)
cmove  %ebp,%esi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %rbx,%rsi
call   1040 <scanf@plt>
mov    0x4(%rsp),%eax
test   %eax,%eax
jne    1160 <main+0x40>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

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

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