int main(void) {
  int n;
  double x;
  printf("请输入一个整数：");
  scanf("%d", &n);
  printf("The square of the number is %d .\n", ((n) * (n)));
  printf("Print n++ %d .\n", ((n++) * (n++)));
  printf("Please input a real number:");
  scanf("%lf", &x);
  printf("The square of the number is %f .\n", ((x) * (x)));
  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    0xed5(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
mov    -0x8(%rbp),%esi
imul   -0x8(%rbp),%esi
lea    0xebf(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%esi
mov    %esi,%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
mov    -0x8(%rbp),%eax
mov    %eax,%ecx
add    $0x1,%ecx
mov    %ecx,-0x8(%rbp)
imul   %eax,%esi
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xebc(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeca(%rip),%rdi
lea    -0x10(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movsd  -0x10(%rbp),%xmm0
mulsd  -0x10(%rbp),%xmm0
lea    0xeb2(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
sub    $0x18,%rsp
lea    0xed5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xee0(%rip),%rdi
lea    0xc(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
mov    0xc(%rsp),%esi
imul   %esi,%esi
lea    0xec9(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%eax
lea    0x1(%rax),%esi
lea    0x2(%rax),%ecx
mov    %ecx,0xc(%rsp)
imul   %eax,%esi
lea    0xecc(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xece(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xedc(%rip),%rdi
lea    0x10(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
movsd  0x10(%rsp),%xmm0
mulsd  %xmm0,%xmm0
lea    0xec3(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [25 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\80\E4\B8\AA\E6\95\B4\E6\95\B0\EF\BC\9A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [34 x i8] c"The square of the number is %d .\0A\00"
@.str.3 = [16 x i8] c"Print n++ %d .\0A\00"
@.str.4 = [28 x i8] c"Please input a real number:\00"
@.str.5 = [4 x i8] c"%lf\00"
@.str.6 = [34 x i8] c"The square of the number is %f .\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca double
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%5 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%6 = load i32, i32* %2
%7 = load i32, i32* %2
%8 = mul nsw i32 %6, %7
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.2, i64 0, i64 0), i32 %8)
%10 = load i32, i32* %2
%11 = add nsw i32 %10, 1
store i32 %11, i32* %2
%12 = load i32, i32* %2
%13 = add nsw i32 %12, 1
store i32 %13, i32* %2
%14 = mul nsw i32 %10, %12
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i32 %14)
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0))
%17 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), double* %3)
%18 = load double, double* %3
%19 = load double, double* %3
%20 = fmul double %18, %19
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.6, i64 0, i64 0), double %20)
ret i32 0
}

LLVM IR (-O2):
@.str = [25 x i8] c"\E8\AF\B7\E8\BE\93\E5\85\A5\E4\B8\80\E4\B8\AA\E6\95\B4\E6\95\B0\EF\BC\9A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [34 x i8] c"The square of the number is %d .\0A\00"
@.str.3 = [16 x i8] c"Print n++ %d .\0A\00"
@.str.4 = [28 x i8] c"Please input a real number:\00"
@.str.5 = [4 x i8] c"%lf\00"
@.str.6 = [34 x i8] c"The square of the number is %f .\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca double
%3 = bitcast i32* %1 to i8*
%4 = bitcast double* %2 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%6 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%7 = load i32, i32* %1
%8 = mul nsw i32 %7, %7
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @.str.2, i64 0, i64 0), i32 %8)
%10 = load i32, i32* %1
%11 = add nsw i32 %10, 1
%12 = add nsw i32 %10, 2
store i32 %12, i32* %1
%13 = mul nsw i32 %11, %10
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i32 %13)
%15 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0))
%16 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.5, i64 0, i64 0), double* %2)
%17 = load double, double* %2
%18 = fmul double %17, %17
%19 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @.str.6, i64 0, i64 0), double %18)
ret i32 0
}