C语言多文件编译的例子

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1. #include <stdio.h>
2. int fun1(){
3. printf("The first function!\n");
4. return 0;
5. }
6. int fun2(){
7. printf("The second function!\n");
8. return 0;
9. }
10. int fun3(){
11. printf("The third function!\n");
12. return 0;
13. }

#include <stdio.h>
int fun1(){
    printf("The first function!\n");
    return 0;
}
int fun2(){
    printf("The second function!\n");
    return 0;
}
int fun3(){
    printf("The third function!\n");
    return 0;
}

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1. #ifndef _FUN_H
2. #define _FUN_H
3.  
4. extern int fun1(void);
5. extern int fun2(void);
6. extern int fun3(void);
7.  
8. #endif

#ifndef _FUN_H
#define _FUN_H

extern int fun1(void);
extern int fun2(void);
extern int fun3(void);

#endif

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1. #include <stdio.h>
2. #include <stdlib.h>
3. #include "fun.h"
4.  
5. int main(){
6. fun1();
7. fun2();
8. fun3();
9.  
10. system("pause");
11. return 0;
12. }

#include <stdio.h>
#include <stdlib.h>
#include "fun.h"

int main(){
    fun1();
    fun2();
    fun3();

    system("pause");
    return 0;
}

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1. #ifndef MY_INCLUDE_H
2. #define MY_INCLUDE_H
3. //头文件内容
4. #endif

#ifndef  MY_INCLUDE_H
#define MY_INCLUDE_H
//头文件内容 
#endif