#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 fact(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int p, k, n;
  printf(" Enter permutation number for the patern P(n,k)\n");
  printf("Enter n value : ");
  scanf("%d", &n);
  printf("\nEnter k value : ");
  scanf("%d", &k);
  p = (fact(n) / fact(n - k));
  printf("\nFactorial of P(%d,%d) = %d", n, k, p);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xee4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf12(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1050 <scanf@plt>
lea    0xed7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef4(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
mov    -0xc(%rbp),%edi
call   1040 <fact@plt>
mov    %eax,-0x10(%rbp)
mov    -0xc(%rbp),%edi
sub    -0x8(%rbp),%edi
call   1040 <fact@plt>
mov    %eax,%ecx
mov    -0x10(%rbp),%eax
cltd
idiv   %ecx
mov    %eax,-0x4(%rbp)
mov    -0xc(%rbp),%esi
mov    -0x8(%rbp),%edx
mov    -0x4(%rbp),%ecx
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xef3(%rip),%rdi
call   1030 <puts@plt>
lea    0xea8(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xed6(%rip),%rbx
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
lea    0xe97(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
mov    0x8(%rsp),%edi
call   1050 <fact@plt>
mov    %eax,%ebx
mov    0x8(%rsp),%edi
sub    0xc(%rsp),%edi
call   1050 <fact@plt>
mov    %eax,%ecx
mov    %ebx,%eax
cltd
idiv   %ecx
mov    0x8(%rsp),%esi
mov    0xc(%rsp),%edx
lea    0xe67(%rip),%rdi
mov    %eax,%ecx
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [49 x i8] c" Enter permutation number for the patern P(n,k)\0A\00"
@.str.1 = [17 x i8] c"Enter n value : \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [18 x i8] c"\0AEnter k value : \00"
@.str.4 = [28 x i8] c"\0AFactorial of P(%d,%d) = %d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([49 x i8], [49 x i8]* @.str, i64 0, i64 0))
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %3)
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %2)
%9 = load i32, i32* %3
%10 = call i32 @fact(i32 %9)
%11 = load i32, i32* %3
%12 = load i32, i32* %2
%13 = sub nsw i32 %11, %12
%14 = call i32 @fact(i32 %13)
%15 = sdiv i32 %10, %14
store i32 %15, i32* %1
%16 = load i32, i32* %3
%17 = load i32, i32* %2
%18 = load i32, i32* %1
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0), i32 %16, i32 %17, i32 %18)
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [17 x i8] c"Enter n value : \00"
@.str.2 = [3 x i8] c"%d\00"
@.str.3 = [18 x i8] c"\0AEnter k value : \00"
@.str.4 = [28 x i8] c"\0AFactorial of P(%d,%d) = %d\00"
@str = [48 x i8] c" Enter permutation number for the patern P(n,k)\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
%4 = bitcast i32* %2 to i8*
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([48 x i8], [48 x i8]* @str, i64 0, i64 0))
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %2)
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i32* %1)
%10 = load i32, i32* %2
%11 = call i32 @fact(i32 %10)
%12 = load i32, i32* %2
%13 = load i32, i32* %1
%14 = sub nsw i32 %12, %13
%15 = call i32 @fact(i32 %14)
%16 = sdiv i32 %11, %15
%17 = load i32, i32* %2
%18 = load i32, i32* %1
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0), i32 %17, i32 %18, i32 %16)
ret i32 0
}