C++函数的定义和调用 简单实现加法 乘法运算

#include <iostream>using namespace std;int add(int num1, int num2) //函数的定义{int sum = num1 + num2;return sum; }double acc(double num1, double num2, double num3) //函数的定义{double sum1= num1 * num2 * num3;return sum1;}void main()//函数的调用,void无返回值{int a = 10; int b = 20; //定义赋值后，再调用int sum = add(a, b);double sum1 = acc(1.1, 2.3, 4.5); //直接赋值调用cout << "sum="<<sum << endl; //输出cout << "sum1=" << sum1 << endl;}