#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 C(unsigned int, unsigned int);
int /*<<< orphan*/ printf(char *, ...);
int scanf(char *, unsigned int *);
int main(void) {
  unsigned n, r;
  printf("n = ");
  if (scanf("%u%*[^\n]", &n) != 1)
    return 1;
  printf("r = ");
  if (scanf("%u%*[^\n]", &r) != 1)
    return 1;
  printf("C(%u, %u) = %u\n", n, r, C(n, r));
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeb1(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
cmp    $0x1,%eax
je     1172 <main+0x42>
movl   $0x1,-0x4(%rbp)
jmp    11d9 <main+0xa9>
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe7e(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1050 <scanf@plt>
cmp    $0x1,%eax
je     11a5 <main+0x75>
movl   $0x1,-0x4(%rbp)
jmp    11d9 <main+0xa9>
mov    -0x8(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%edi
mov    -0xc(%rbp),%esi
call   1040 <C@plt>
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%edx
mov    %eax,%ecx
lea    0xe48(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xec6(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xebd(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    $0x1,%ebx
cmp    $0x1,%eax
jne    11a4 <main+0x74>
lea    0xeab(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xe94(%rip),%rdi
mov    %rsp,%rsi
call   1050 <scanf@plt>
cmp    $0x1,%eax
jne    11a4 <main+0x74>
mov    0x4(%rsp),%ebx
mov    (%rsp),%ebp
mov    %ebx,%edi
mov    %ebp,%esi
call   1040 <C@plt>
lea    0xe7e(%rip),%rdi
mov    %ebx,%esi
mov    %ebp,%edx
mov    %eax,%ecx
xor    %eax,%eax
call   1030 <printf@plt>
xor    %ebx,%ebx
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [5 x i8] c"n = \00"
@.str.1 = [9 x i8] c"%u%*[^\0A]\00"
@.str.2 = [5 x i8] c"r = \00"
@.str.3 = [16 x i8] c"C(%u, %u) = %u\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%6 = icmp ne i32 %5, 1
br i1 %6, label %7, label %8
7: ; preds = %0
store i32 1, i32* %1
br label %20
8: ; preds = %0
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%11 = icmp ne i32 %10, 1
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 1, i32* %1
br label %20
13: ; preds = %8
%14 = load i32, i32* %2
%15 = load i32, i32* %3
%16 = load i32, i32* %2
%17 = load i32, i32* %3
%18 = call i32 @C(i32 %16, i32 %17)
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i32 %14, i32 %15, i32 %18)
store i32 0, i32* %1
br label %20
20: ; preds = %13, %12, %7
%21 = load i32, i32* %1
ret i32 %21
}

LLVM IR (-O2):
@.str = [5 x i8] c"n = \00"
@.str.1 = [9 x i8] c"%u%*[^\0A]\00"
@.str.2 = [5 x i8] c"r = \00"
@.str.3 = [16 x i8] c"C(%u, %u) = %u\0A\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 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%7 = icmp eq i32 %6, 1
br i1 %7, label %8, label %17
8: ; preds = %0
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%10 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%11 = icmp eq i32 %10, 1
br i1 %11, label %12, label %17
12: ; preds = %8
%13 = load i32, i32* %1
%14 = load i32, i32* %2
%15 = call i32 @C(i32 %13, i32 %14)
%16 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i32 %13, i32 %14, i32 %15)
br label %17
17: ; preds = %8, %0, %12
%18 = phi i32 [ 0, %12 ], [ 1, %0 ], [ 1, %8 ]
ret i32 %18
}