#include <stdio.h>

class Calculator {
public:
    int add(int a, int b) {
        return a + b;
    }

    int subtract(int a, int b) {
        return a - b;
    }

    int multiply(int a, int b) {
        return a * b;
    }

    int divide(int a, int b) {
        if (b == 0) {
            printf("除数不能为0");
            return -1;
        }
        return a / b;
    }
};

int main() {
    Calculator calculator;
    int a = 10;
    int b = 5;
    int c = 7;
    int result;

    result = calculator.add(a, b);
    printf("加法结果： %d
", result);

    result = calculator.subtract(a, b);
    printf("减法结果： %d
", result);

    result = calculator.multiply(a, b);
    printf("乘法结果： %d
", result);

    result = calculator.divide(a, b);
    printf("除法结果： %d
", result);

    return 0;
}