#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 argc, char *argv[]) {
  int inputInt = 0;
  int binaryDig = 0;
  printf("Please enter a number in decimal (base 10): ");
  scanf("%d", &inputInt);
  while (inputInt > 0) {
    inputInt /= 2;
    binaryDig++;
  }
  printf("\n\nWhen converted to binary, your number would be %d digits.\n",
         binaryDig);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed4(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x14(%rbp)
jle    1188 <main+0x68>
mov    -0x14(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,-0x14(%rbp)
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    1162 <main+0x42>
mov    -0x18(%rbp),%esi
lea    0xe9e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
movl   $0x0,0xc(%rsp)
lea    0xecc(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee9(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
jle    1170 <main+0x50>
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
mov    %eax,%ecx
shr    %eax
add    $0x1,%ebx
cmp    $0x1,%ecx
ja     1160 <main+0x40>
mov    %eax,0xc(%rsp)
lea    0xeb9(%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 = [45 x i8] c"Please enter a number in decimal (base 10): \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [61 x i8] c"\0A\0AWhen converted to binary, your number would be %d digits.\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 0, i32* %6
store i32 0, i32* %7
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([45 x i8], [45 x i8]* @.str, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %6)
br label %10
10: ; preds = %13, %2
%11 = load i32, i32* %6
%12 = icmp sgt i32 %11, 0
br i1 %12, label %13, label %18
13: ; preds = %10
%14 = load i32, i32* %6
%15 = sdiv i32 %14, 2
store i32 %15, i32* %6
%16 = load i32, i32* %7
%17 = add nsw i32 %16, 1
store i32 %17, i32* %7
br label %10
18: ; preds = %10
%19 = load i32, i32* %7
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([61 x i8], [61 x i8]* @.str.2, i64 0, i64 0), i32 %19)
ret i32 0
}

LLVM IR (-O2):
@.str = [45 x i8] c"Please enter a number in decimal (base 10): \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [61 x i8] c"\0A\0AWhen converted to binary, your number would be %d digits.\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = bitcast i32* %3 to i8*
store i32 0, i32* %3
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([45 x i8], [45 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* %3)
%7 = load i32, i32* %3
%8 = icmp sgt i32 %7, 0
br i1 %8, label %9, label %16
9: ; preds = %2, %9
%10 = phi i32 [ %13, %9 ], [ 0, %2 ]
%11 = phi i32 [ %12, %9 ], [ %7, %2 ]
%12 = lshr i32 %11, 1
%13 = add nuw nsw i32 %10, 1
%14 = icmp ult i32 %11, 2
br i1 %14, label %15, label %9
15: ; preds = %9
store i32 %12, i32* %3
br label %16
16: ; preds = %15, %2
%17 = phi i32 [ %13, %15 ], [ 0, %2 ]
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([61 x i8], [61 x i8]* @.str.2, i64 0, i64 0), i32 %17)
ret i32 0
}