#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 */
unsigned int mask(int, int);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ scanf(char *, ...);
int /*<<< orphan*/ showbits(unsigned int);
int main() {
  unsigned int num;
  int pos;
  int bits;
  printf("Enter a number:");
  scanf("%d", &num);
  showbits(num);
  printf("Enter the starting position:");
  scanf("%d", &pos);
  printf("Enter the number of bits:");
  scanf("%d", &bits);
  showbits((mask(pos, bits) & num));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
call   1040 <printf@plt>
lea    0xeae(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
mov    -0x8(%rbp),%edi
call   1030 <showbits@plt>
lea    0xe97(%rip),%rdi
call   1040 <printf@plt>
lea    0xe88(%rip),%rdi
lea    -0xc(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
lea    0xe96(%rip),%rdi
call   1040 <printf@plt>
lea    0xe6a(%rip),%rdi
lea    -0x10(%rbp),%rsi
mov    $0x0,%al
call   1050 <scanf@plt>
mov    -0xc(%rbp),%edi
mov    -0x10(%rbp),%esi
call   1060 <mask@plt>
mov    %eax,%edi
and    -0x8(%rbp),%edi
call   1030 <showbits@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xeb4(%rip),%rdi
call   1040 <printf@plt>
lea    0xeb8(%rip),%rbx
lea    0x4(%rsp),%rsi
mov    %rbx,%rdi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0x4(%rsp),%edi
call   1030 <showbits@plt>
lea    0xe9c(%rip),%rdi
call   1040 <printf@plt>
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
xor    %eax,%eax
call   1050 <scanf@plt>
lea    0xe9e(%rip),%rdi
call   1040 <printf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
xor    %eax,%eax
call   1050 <scanf@plt>
mov    0xc(%rsp),%edi
mov    0x8(%rsp),%esi
call   1060 <mask@plt>
and    0x4(%rsp),%eax
mov    %eax,%edi
call   1030 <showbits@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [16 x i8] c"Enter a number:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [29 x i8] c"Enter the starting position:\00"
@.str.3 = [26 x i8] c"Enter the number of bits:\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%6 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%7 = load i32, i32* %2
%8 = call i32 @showbits(i32 %7)
%9 = call i32 @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%11 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%12 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %4)
%13 = load i32, i32* %3
%14 = load i32, i32* %4
%15 = call i32 @mask(i32 %13, i32 %14)
%16 = load i32, i32* %2
%17 = and i32 %15, %16
%18 = call i32 @showbits(i32 %17)
ret i32 0
}

LLVM IR (-O2):
@.str = [16 x i8] c"Enter a number:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [29 x i8] c"Enter the starting position:\00"
@.str.3 = [26 x i8] c"Enter the number of bits:\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = bitcast i32* %1 to i8*
%5 = bitcast i32* %2 to i8*
%6 = bitcast i32* %3 to i8*
%7 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%8 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%9 = load i32, i32* %1
%10 = call i32 @showbits(i32 %9)
%11 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str.2, i64 0, i64 0))
%12 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%13 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%14 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%15 = load i32, i32* %2
%16 = load i32, i32* %3
%17 = call i32 @mask(i32 %15, i32 %16)
%18 = load i32, i32* %1
%19 = and i32 %18, %17
%20 = call i32 @showbits(i32 %19)
ret i32 0
}