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                [TOC] # 多文件聯合編程 先寫頭文件.h結尾 ~~~ #pragma once #define _CRT_SECURE_NO_WARNINGS #include<stdio.h> #include<string.h> #include<stdlib.h> extern int a1(int a, int b); ~~~ 然后在其他文件中 ~~~ #include "1頭文件.h" int main() { int a = a1(1, 3); printf("%d\n", a); system("pause"); return EXIT_SUCCESS; } ~~~ 為了避免同一個文件被include多次,c/c++中有兩種方式,一種是`#ifndef`方式,一種是`#pragrame once`方式 方法一,舊的程序 ![](https://box.kancloud.cn/6d4c92270320061590d0e84efb204956_310x173.png) 方法二 ~~~ `#pragrame once //聲明語句 ~~~
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