#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 i = 0, num;
  printf("%s\n", "Enter the number: ");
  scanf("%d", &num);
  while (num != 0) {
    num /= 10;
    i++;
  }
  printf("The number of digits are: %d", i);
  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    0xec0(%rip),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedf(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0xc(%rbp)
je     1181 <main+0x61>
mov    -0xc(%rbp),%eax
mov    $0xa,%ecx
cltd
idiv   %ecx
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    115b <main+0x3b>
mov    -0x8(%rbp),%esi
lea    0xe8c(%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    0xec8(%rip),%rdi
call   1030 <puts@plt>
lea    0xee9(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%eax
xor    %esi,%esi
test   %eax,%eax
je     1186 <main+0x56>
nopl   0x0(%rax,%rax,1)
movslq %eax,%rcx
imul   $0x66666667,%rcx,%rax
mov    %rax,%rdx
shr    $0x3f,%rdx
sar    $0x22,%rax
add    %edx,%eax
add    $0x1,%esi
add    $0x9,%ecx
cmp    $0x12,%ecx
ja     1160 <main+0x30>
mov    %eax,0x4(%rsp)
lea    0xe86(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%s\0A\00"
@.str.1 = [19 x i8] c"Enter the number: \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [29 x i8] c"The number of digits are: %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %3)
br label %6
6: ; preds = %9, %0
%7 = load i32, i32* %3
%8 = icmp ne i32 %7, 0
br i1 %8, label %9, label %14
9: ; preds = %6
%10 = load i32, i32* %3
%11 = sdiv i32 %10, 10
store i32 %11, i32* %3
%12 = load i32, i32* %2
%13 = add nsw i32 %12, 1
store i32 %13, i32* %2
br label %6
14: ; preds = %6
%15 = load i32, i32* %2
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.3, i64 0, i64 0), i32 %15)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [19 x i8] c"Enter the number: \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [29 x i8] c"The number of digits are: %d\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp eq i32 %5, 0
br i1 %6, label %15, label %7
7: ; preds = %0, %7
%8 = phi i32 [ %11, %7 ], [ 0, %0 ]
%9 = phi i32 [ %10, %7 ], [ %5, %0 ]
%10 = sdiv i32 %9, 10
%11 = add nuw nsw i32 %8, 1
%12 = add i32 %9, 9
%13 = icmp ult i32 %12, 19
br i1 %13, label %14, label %7
14: ; preds = %7
store i32 %10, 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 ([29 x i8], [29 x i8]* @.str.3, i64 0, i64 0), i32 %16)
ret i32 0
}