使用c++和汇编语言混合编程，devc++中执行，内嵌调用 程序例子5个

以下是使用C++和汇编语言混合编程的5个程序例子，这些例子可以在Dev-C++中执行，并且使用了内嵌调用。

1. 计算两个整数的和

#include <iostream>
using namespace std;

int main() {
    int a = 10, b = 20, sum;
    __asm {
        mov eax, a
        add eax, b
        mov sum, eax
    }
    cout << "The sum of " << a << " and " << b << " is " << sum << endl;
    return 0;
}

2. 将一段字符串反转

#include <iostream>
#include <cstring>
using namespace std;

int main() {
    char str[] = "Hello, world!";
    int len = strlen(str);

    __asm {
        mov esi, offset str
        mov edi, esi
        add edi, len
        dec edi
    loop1:
        cmp esi, edi
        jg done
        mov al, [esi]
        mov bl, [edi]
        mov [esi], bl
        mov [edi], al
        inc esi
        dec edi
        jmp loop1
    done:
    }

    cout << "Reversed string: " << str << endl;
    return 0;
}

3. 计算阶乘

#include <iostream>
using namespace std;

int main() {
    int n = 5, fact = 1;

    __asm {
        mov ecx, n
        mov eax, 1
    loop1:
        cmp ecx, 0
        je done
        mul ecx
        dec ecx
        jmp loop1
    done:
        mov fact, eax
    }

    cout << "Factorial of " << n << " is " << fact << endl;
    return 0;
}

4. 判断一个数是否为素数

#include <iostream>
using namespace std;

int main() {
    int n = 17, flag = 0;

    __asm {
        mov ecx, n
        mov ebx, 2
    loop1:
        cmp ebx, ecx
        jge done
        mov edx, 0
        div ebx
        cmp edx, 0
        je composite
        inc ebx
        jmp loop1
    composite:
        mov flag, 1
        jmp done
    done:
    }

    if (flag)
        cout << n << " is not a prime number" << endl;
    else
        cout << n << " is a prime number" << endl;
    return 0;
}

5. 将一个数组中的元素翻倍

#include <iostream>
using namespace std;

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr) / sizeof(arr[0]);

    __asm {
        mov ecx, n
        mov esi, offset arr
    loop1:
        cmp ecx, 0
        je done
        mov eax, [esi]
        add eax, eax
        mov [esi], eax
        add esi, 4
        dec ecx
        jmp loop1
    done:
    }

    cout << "Doubled array: ";
    for (int i = 0; i < n; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;
    return 0;
}