Method of C language self defining function

Hello everyone , I meet you again , I'm your friend, Quan Jun .

One 、C Call of custom function of language

1. Declare a custom function ：

void fun(void);// Declaration of functions

You can also write custom functions before the main function ;

2. Call the user-defined function in the main function ：

int main(void)

{

fun();// call fun function ;

return 0;

}

3. The function of writing custom functions ：

void fun(void)

{

​ int a=12;

​ printf(“a=%d”,a); Output a

}

The source code is as follows ：

#include "stdio.h"

void fun(void);// Declare custom functions

int main(void)// The main function {fun();// call fun function “

	return 0;

Copy

}

void fun(void){int a=12;// Define an integer constant a=12;printf("a=%d",a);// Output a;}

shipment Line program results ：

a=12

Two 、 Functions with parameters

1, Declare a custom function ：

void fun(uchar a);

2, Call function

int main(void)// The main function { int i; for(i=0;i<8;i++) { fun(i);// call fun function There must be parameters in brackets , Otherwise, an error will be reported printf(“\n”);// Line break }

return 0;

Copy

}

3. Write custom functions

void fun(char a)// fun The function takes a char Parameters of type { int i=0; char b=’*’; for(i=8;i>0;i–) printf(“%c”,b);// Output a; }

Source program ：

#include "stdio.h"

void fun(char a);// Declare custom functions

int main(void)// The main function {int i;for(i=0;i<8;i++){fun(i);// call fun function printf("\n");// Line break }

return 0;

Copy

}

void fun(char a){int i=0;char b='*';for(i=8;i>0;i--)printf("%c",b);// Output a;}

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