6.3 函数的调用

/定义
{
int add(int numl, int num2） //定义中的num1,num2称为形式参数，简称形参
{
    int sum = num1 + num2;
    return sum;
}

int main() {
    int a = 10; 
    int b = 10;
    //调用add函数
    int sum = add (a，b);//调用时的a，b称为实际参数，简称实参
    cout << "sum = " << sum << endl;
    a = 100;
    b = 100;
    sum = add(a, b);
    cout<< " sum="<<sum << endl;
    system "pause");
}