#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() {
  int n;
  printf("Enter a number: \n");
  scanf("%d", &n);
  int digits = 1;
  while ((n /= 10) != 0)
    ++digits;
  printf("The number of digits is: %d", digits);
  return 0;
}


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    0xee7(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x1,-0xc(%rbp)
mov    -0x8(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
je     1179 <main+0x59>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1154 <main+0x34>
mov    -0xc(%rbp),%esi
lea    0xe8f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee4(%rip),%rdi
call   1030 <puts@plt>
lea    0xed5(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
xor    %esi,%esi
mov    0x4(%rsp),%eax
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
movslq %eax,%rcx
imul   $0x66666667,%rcx,%rax
mov    %rax,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rax
add    %edx,%eax
add    $0x9,%ecx
add    $0x1,%esi
cmp    $0x12,%ecx
ja     1160 <main+0x30>
mov    %eax,0x4(%rsp)
lea    0xe73(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [18 x i8] c"Enter a number: \0A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [28 x i8] c"The number of digits is: %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
store i32 1, i32* %3
br label %6
6: ; preds = %10, %0
%7 = load i32, i32* %2
%8 = sdiv i32 %7, 10
store i32 %8, i32* %2
%9 = icmp ne i32 %8, 0
br i1 %9, label %10, label %13
10: ; preds = %6
%11 = load i32, i32* %3
%12 = add nsw i32 %11, 1
store i32 %12, i32* %3
br label %6
13: ; preds = %6
%14 = load i32, i32* %3
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.2, i64 0, i64 0), i32 %14)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [28 x i8] c"The number of digits is: %d\00"
@str = [17 x i8] c"Enter a number: \00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(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
br label %6
6: ; preds = %6, %0
%7 = phi i32 [ %5, %0 ], [ %9, %6 ]
%8 = phi i32 [ 1, %0 ], [ %12, %6 ]
%9 = sdiv i32 %7, 10
%10 = add i32 %7, 9
%11 = icmp ult i32 %10, 19
%12 = add nuw nsw i32 %8, 1
br i1 %11, label %13, label %6
13: ; preds = %6
store i32 %9, i32* %1
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.2, i64 0, i64 0), i32 %8)
ret i32 0
}