基于Visual Studio 2015
将下面两个cpp文件置于同一源文件目录下即可
源.cpp
#include <stdio.h> int main() { extern int sum(int x, int y); int x, y; printf("please enter two nums:"); scanf("%d%d", &x, &y); printf("sum:%d\n", sum(x, y)); return 0; }
add.cpp
int sum(int x, int y) { return x + y; }
运行结果如下: