编写一个C函数求x!,再编写一个汇编程序,调用C函数来计算1!+2!+…+6!
时间: 2023-03-30 19:04:48 浏览: 87
C语言函数代码如下:
```
#include <stdio.h>
int factorial(int x) {
if (x == ) {
return 1;
} else {
return x * factorial(x - 1);
}
}
int main() {
int x = 6;
printf("%d! = %d\n", x, factorial(x));
return ;
}
```
汇编程序代码如下:
```
section .data
x db 1, 2, 3, 4, 5, 6
section .text
global _start
_start:
mov ecx, 6
mov esi, x
mov ebx, 1
loop_start:
push ecx
push dword [esi]
call factorial
add esp, 8
mul ebx
mov ebx, eax
pop ecx
inc esi
loop loop_start
; 输出结果
mov eax, 1
mov ebx,
int x80
factorial:
push ebp
mov ebp, esp
mov eax, [ebp + 8]
cmp eax,
je end_factorial
dec eax
push eax
call factorial
add esp, 4
imul eax, [ebp + 8]
jmp end_factorial
end_factorial:
pop ebp
ret
```
这个汇编程序会计算1!到6!的乘积,并输出结果。