#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 *, float *);
int main() {
  float cost, payment;
  printf("Cost of the item: ");
  scanf("%f", &cost);
  printf("Amount tendered:  ");
  scanf("%f", &payment);
  cost > payment ? printf("Still due: %.2f", cost - payment)
                 : printf("Change: %.2f", payment - cost);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xecf(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
lea    0xec2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeb1(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0x8(%rbp),%xmm0
ucomiss -0xc(%rbp),%xmm0
jbe    119b <main+0x7b>
movss  -0x8(%rbp),%xmm0
subss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe9a(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
jmp    11b7 <main+0x97>
movss  -0xc(%rbp),%xmm0
subss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe89(%rip),%rdi
mov    $0x1,%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    0xed4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed9(%rip),%rbx
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
call   1040 <scanf@plt>
movss  0xc(%rsp),%xmm0
movss  0x8(%rsp),%xmm1
ucomiss %xmm1,%xmm0
ja     117c <main+0x5c>
subss  %xmm0,%xmm1
movaps %xmm1,%xmm0
jmp    1180 <main+0x60>
subss  %xmm1,%xmm0
lea    0xea2(%rip),%rax
lea    0xeab(%rip),%rdi
cmova  %rax,%rdi
cvtss2sd %xmm0,%xmm0
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [19 x i8] c"Cost of the item: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [19 x i8] c"Amount tendered: \00"
@.str.3 = [16 x i8] c"Still due: %.2f\00"
@.str.4 = [13 x i8] c"Change: %.2f\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %2)
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %3)
%8 = load float, float* %2
%9 = load float, float* %3
%10 = fcmp ogt float %8, %9
br i1 %10, label %11, label %17
11: ; preds = %0
%12 = load float, float* %2
%13 = load float, float* %3
%14 = fsub float %12, %13
%15 = fpext float %14 to double
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), double %15)
br label %23
17: ; preds = %0
%18 = load float, float* %3
%19 = load float, float* %2
%20 = fsub float %18, %19
%21 = fpext float %20 to double
%22 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.4, i64 0, i64 0), double %21)
br label %23
23: ; preds = %17, %11
%24 = phi i32 [ %16, %11 ], [ %22, %17 ]
ret i32 0
}

LLVM IR (-O2):
@.str = [19 x i8] c"Cost of the item: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [19 x i8] c"Amount tendered: \00"
@.str.3 = [16 x i8] c"Still due: %.2f\00"
@.str.4 = [13 x i8] c"Change: %.2f\00"
define i32 @main() {
%1 = alloca float
%2 = alloca float
%3 = bitcast float* %1 to i8*
%4 = bitcast float* %2 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 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), float* %1)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %2)
%9 = load float, float* %1
%10 = load float, float* %2
%11 = fcmp ogt float %9, %10
%12 = fsub float %10, %9
%13 = fsub float %9, %10
%14 = select i1 %11, float %13, float %12
%15 = select i1 %11, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.4, i64 0, i64 0)
%16 = fpext float %14 to double
%17 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) %15, double %16)
ret i32 0
}