#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(void) {
  float cels, fahr;
  printf("輸入華氏溫度: ");
  scanf("%f", &fahr);
  cels = (float)(fahr - 32) * 5 / 9;
  printf("華氏 %f 度轉換後為攝氏 %f 度\n", fahr, cels);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xed6(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedd(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0xc(%rbp),%xmm0
movss  0xeae(%rip),%xmm1
subss  %xmm1,%xmm0
movss  0xe9e(%rip),%xmm1
mulss  %xmm1,%xmm0
movss  0xe8e(%rip),%xmm1
divss  %xmm1,%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0x8(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
lea    0xe90(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xeeb(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
movss  0x4(%rsp),%xmm0
movss  0xeb2(%rip),%xmm1
addss  %xmm0,%xmm1
mulss  0xeaa(%rip),%xmm1
divss  0xea6(%rip),%xmm1
cvtss2sd %xmm0,%xmm0
cvtss2sd %xmm1,%xmm1
lea    0xeb3(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [21 x i8] c"\E8\BC\B8\E5\85\A5\E8\8F\AF\E6\B0\8F\E6\BA\AB\E5\BA\A6: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [40 x i8] c"\E8\8F\AF\E6\B0\8F %f \E5\BA\A6\E8\BD\89\E6\8F\9B\E5\BE\8C\E7\82\BA\E6\94\9D\E6\B0\8F %f \E5\BA\A6\0A\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 ([21 x i8], [21 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* %3)
%6 = load float, float* %3
%7 = fsub float %6, 3.200000e+01
%8 = fmul float %7, 5.000000e+00
%9 = fdiv float %8, 9.000000e+00
store float %9, float* %2
%10 = load float, float* %3
%11 = fpext float %10 to double
%12 = load float, float* %2
%13 = fpext float %12 to double
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str.2, i64 0, i64 0), double %11, double %13)
ret i32 0
}

LLVM IR (-O2):
@.str = [21 x i8] c"\E8\BC\B8\E5\85\A5\E8\8F\AF\E6\B0\8F\E6\BA\AB\E5\BA\A6: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [40 x i8] c"\E8\8F\AF\E6\B0\8F %f \E5\BA\A6\E8\BD\89\E6\8F\9B\E5\BE\8C\E7\82\BA\E6\94\9D\E6\B0\8F %f \E5\BA\A6\0A\00"
define i32 @main() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 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 = load float, float* %1
%6 = fadd float %5, -3.200000e+01
%7 = fmul float %6, 5.000000e+00
%8 = fdiv float %7, 9.000000e+00
%9 = fpext float %5 to double
%10 = fpext float %8 to double
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([40 x i8], [40 x i8]* @.str.2, i64 0, i64 0), double %9, double %10)
ret i32 0
}