#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*/ flushall();
int /*<<< orphan*/ getchar();
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, float *);
main() {
  float celcius;
  float farenheit;
  printf("Enter a temperature in degress Farenheit: ");
  scanf("%f", &farenheit);
  flushall();
  celcius = (farenheit - 32.0) * (5.0 / 9.0);
  printf("This temperature converted is %2.2f degrees Celcius", celcius);
  getchar();
}


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    0xede(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1060 <scanf@plt>
mov    $0x0,%al
call   1040 <flushall@plt>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  0xe8a(%rip),%xmm1
subsd  %xmm1,%xmm0
movsd  0xe76(%rip),%xmm1
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0x4(%rbp)
movss  -0x4(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe97(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
mov    $0x0,%al
call   1050 <getchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee5(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1060 <scanf@plt>
xor    %eax,%eax
call   1040 <flushall@plt>
movss  0x4(%rsp),%xmm0
cvtss2sd %xmm0,%xmm0
addsd  0xe87(%rip),%xmm0
mulsd  0xe87(%rip),%xmm0
cvtsd2ss %xmm0,%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xeae(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [43 x i8] c"Enter a temperature in degress Farenheit: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [52 x i8] c"This temperature converted is %2.2f degrees Celcius\00"
define i32 @main() {
%1 = alloca float
%2 = alloca float
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %2)
%5 = call i32 (...) @flushall()
%6 = load float, float* %2
%7 = fpext float %6 to double
%8 = fsub double %7, 3.200000e+01
%9 = fmul double %8, 0x3FE1C71C71C71C72
%10 = fptrunc double %9 to float
store float %10, float* %1
%11 = load float, float* %1
%12 = fpext float %11 to double
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([52 x i8], [52 x i8]* @.str.2, i64 0, i64 0), double %12)
%14 = call i32 (...) @getchar()
ret i32 0
}

LLVM IR (-O2):
@.str = [43 x i8] c"Enter a temperature in degress Farenheit: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [52 x i8] c"This temperature converted is %2.2f degrees Celcius\00"
define i32 @main() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %1)
%5 = call i32 (...) @flushall()
%6 = load float, float* %1
%7 = fpext float %6 to double
%8 = fadd double %7, -3.200000e+01
%9 = fmul double %8, 0x3FE1C71C71C71C72
%10 = fptrunc double %9 to float
%11 = fpext float %10 to double
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([52 x i8], [52 x i8]* @.str.2, i64 0, i64 0), double %11)
%13 = call i32 (...) @getchar()
ret i32 0
}