C语言之函数原型(codeblocks编译环境)

迷南。 2022-11-13 15:23 203阅读 0赞

问题: 函数原型的作用是什么?

![20210327144137386.png][]

#include<stdio.h>
    //无函数原型, 程序编译时会报错.
    int main()
    {
        int x ,y;
        scanf("%d%d", &x, &y);
        printf("max=%d\n", get_Max(x, y));
        //
        return 0;
    }
    int get_Max(int a, int b)
    {
        return a>=b ? a : b;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70][]

#include<stdio.h>
    int get_Max(int x, int y);//函数原型
    int main()
    {
        int x ,y;
        scanf("%d%d", &x, &y);
        printf("max=%d\n", get_Max(x, y));
        //
        return 0;
    }
    int get_Max(int a, int b)
    {
        return a>=b ? a : b;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 1][]

若函数P()在函数get\_Max()中被调用, 但函数P()的函数定义位于get\_Max()函数定义之后, 这时只需在get\_Max()函数定义之前加入函数P()的函数原型即可. 另外, 函数原型不一定都要写到程序的开头.

#include<stdio.h>
    int get_Max(int t, int z);//函数原型
    int main()
    {
        int x ,y;
        scanf("%d%d", &x, &y);
        printf("max=%d\n", get_Max(x, y));
        //
        return 0;
    }
    void P();//函数原型
    int get_Max(int a, int b)
    {
        P();
        return a>=b ? a : b;
    }
    void P()
    {
        printf("Welcome!\n");
        return ;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 2][]

在程序开头给出所有函数的函数原型, 这是一种良好的编程习惯.

#include<stdio.h>
    int get_Max(int t, int z);
    void P();//函数原型
    int get_Max(int a, int b)
    {
        P();
        return a>=b ? a : b;
    }
    void P()
    {
        printf("Welcome!\n");
        return ;
    }
    int main()
    {
        int x ,y;
        scanf("%d%d", &x, &y);
        printf("max=%d\n", get_Max(x, y));
        //
        return 0;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 3][]

[20210327144137386.png]: /images/20221022/dcdc4ada0b6d43ccb8873bed4fd779a2.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 1]: /images/20221022/c585456847fe46fa8a4b9b4e238e9c2a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210327145604654.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20210327150247188.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw==,size_16,color_FFFFFF,t_70