一、主函数文件要include 头文件 fun.h
#include <iostream> #include "fun.h" using namespace std; int main() { int a=6,b=4; cout<<fun(a,b); return 0; }
二、头文件fun.h 写具体函数的声明
int fun(int,int);
三、源文件fun.cpp,写子函数定义
int fun(int a, int b){ return a+b; }
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