c语言编写函数求两个数

你的问题不太清楚，是要求两个数的和、差、积还是商？下面我就分别给出这些函数的示例代码。

1. 求两个数的和

#include <stdio.h>

int add(int a, int b) {
    return a + b;
}

int main() {
    int num1 = 10, num2 = 20;
    int sum = add(num1, num2);
    printf("The sum of %d and %d is %d\n", num1, num2, sum);
    return 0;
}

2. 求两个数的差

#include <stdio.h>

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

int main() {
    int num1 = 20, num2 = 10;
    int diff = sub(num1, num2);
    printf("The difference between %d and %d is %d\n", num1, num2, diff);
    return 0;
}

3. 求两个数的积

#include <stdio.h>

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

int main() {
    int num1 = 5, num2 = 8;
    int product = mul(num1, num2);
    printf("The product of %d and %d is %d\n", num1, num2, product);
    return 0;
}

4. 求两个数的商

#include <stdio.h>

float div(float a, float b) {
    return a / b;
}

int main() {
    float num1 = 10.0, num2 = 3.0;
    float quotient = div(num1, num2);
    printf("The quotient of %f and %f is %f\n", num1, num2, quotient);
    return 0;
}

注意，对于除法运算，我们需要使用 `float` 类型而不是 `int` 类型，否则结果可能不准确。