#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_s(char *, int *);
int main() {
  int r;
  float s = 0;
  printf("ÇëÊäÈëÔ²µÄ°ë¾¶£º");
  scanf_s("%d", &r);
  s = 3.14 * r * r;
  printf("%f", s);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xedd(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf_s@plt>
cvtsi2sdl -0x8(%rbp),%xmm1
movsd  0xe9e(%rip),%xmm0
mulsd  %xmm1,%xmm0
cvtsi2sdl -0x8(%rbp),%xmm1
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xea4(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xee0(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xef3(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf_s@plt>
cvtsi2sdl 0x4(%rsp),%xmm0
movsd  0xeb2(%rip),%xmm1
mulsd  %xmm0,%xmm1
mulsd  %xmm0,%xmm1
xorps  %xmm0,%xmm0
cvtsd2ss %xmm1,%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xec4(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [33 x i8] c"\C3\87\C3\AB\C3\8A\C3\A4\C3\88\C3\AB\C3\94\C2\B2\C2\B5\C3\84\C2\B0\C3\AB\C2\BE\C2\B6\C2\A3\C2\BA\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [3 x i8] c"%f\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca float
store i32 0, i32* %1
store float 0.000000e+00, float* %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf_s(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%6 = load i32, i32* %2
%7 = sitofp i32 %6 to double
%8 = fmul double 3.140000e+00, %7
%9 = load i32, i32* %2
%10 = sitofp i32 %9 to double
%11 = fmul double %8, %10
%12 = fptrunc double %11 to float
store float %12, float* %3
%13 = load float, float* %3
%14 = fpext float %13 to double
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), double %14)
ret i32 0
}

LLVM IR (-O2):
@.str = [33 x i8] c"\C3\87\C3\AB\C3\8A\C3\A4\C3\88\C3\AB\C3\94\C2\B2\C2\B5\C3\84\C2\B0\C3\AB\C2\BE\C2\B6\C2\A3\C2\BA\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [3 x i8] c"%f\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([33 x i8], [33 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf_s(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = sitofp i32 %5 to double
%7 = fmul double %6, 3.140000e+00
%8 = fmul double %7, %6
%9 = fptrunc double %8 to float
%10 = fpext float %9 to double
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), double %10)
ret i32 0
}