#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*/ clrscr();
int /*<<< orphan*/ getch();
int nCr(int, int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *, int *);
void main() {
  int ans, n, r;
  clrscr();
  printf("enter value of n & r:");
  scanf("%d %d", &n, &r);
  ans = nCr(n, r);
  printf("answer : %d", ans);
  getch();
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    $0x0,%al
call   1030 <clrscr@plt>
lea    0xe9a(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xea2(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0xc(%rbp),%rdx
call   1050 <scanf@plt>
mov    -0x8(%rbp),%edi
mov    -0xc(%rbp),%esi
call   1070 <nCr@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%esi
lea    0xe83(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1060 <getch@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
xor    %eax,%eax
call   1030 <clrscr@plt>
lea    0xea1(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xea9(%rip),%rdi
lea    0x4(%rsp),%rsi
mov    %rsp,%rdx
call   1050 <scanf@plt>
mov    0x4(%rsp),%edi
mov    (%rsp),%esi
call   1070 <nCr@plt>
lea    0xe8f(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
call   1060 <getch@plt>
pop    %rax
ret

LLVM IR (-O0):
@.str = [22 x i8] c"enter value of n & r:\00"
@.str.1 = [6 x i8] c"%d %d\00"
@.str.2 = [12 x i8] c"answer : %d\00"
define void @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = call i32 (...) @clrscr()
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32* %2, i32* %3)
%7 = load i32, i32* %2
%8 = load i32, i32* %3
%9 = call i32 @nCr(i32 %7, i32 %8)
store i32 %9, i32* %1
%10 = load i32, i32* %1
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 %10)
%12 = call i32 (...) @getch()
ret void
}

LLVM IR (-O2):
@.str = [22 x i8] c"enter value of n & r:\00"
@.str.1 = [6 x i8] c"%d %d\00"
@.str.2 = [12 x i8] c"answer : %d\00"
define void @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
%4 = bitcast i32* %2 to i8*
%5 = tail call i32 (...) @clrscr()
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i32* %1, i32* %2)
%8 = load i32, i32* %1
%9 = load i32, i32* %2
%10 = call i32 @nCr(i32 %8, i32 %9)
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 %10)
%12 = call i32 (...) @getch()
ret void
}