Function

A function is a combination of more than one statement which execute together one by one to achieved some specific task. Function code run while calling. There are many variety of functions some takes arguments and return something or takes argument and doesn’t return and more.

C language is known as building block of function all the things of programming is achieved through function. Program gets start running with main function.

Types

No argument, No return

This type of function neither returns anything nor takes arguments. When a function doesn’t have something to return then void is used. Void indicates no return.

Example

void msg(void);

void main()

{

     int a,b,c;

     msg();

}

void msg()

{

     printf("\n\tGirfa Student Help : C Language tutorial");

}

Argument, No Return

This type of function takes argument but doesn’t return something.

 

Example

void sum(int,int);

void main()

{

     int a,b;

     printf("Enter two number>> ");

     scanf("%d%d",&a,&b);

     sum(a,b);

}

void sum(int a,int b)

{

     printf("\n\tSum=%d",a+b);

}

Return,No Argument

Function return but doen’t takes argument

 

Example

int sum(void);

void main()

{

     printf("\t\n%d",sum());

}

int sum()

{

     int a,b,c;

     printf("Enter two number>> ");

     scanf("%d%d",&a,&b);

     c=a+b;

     return(c);

}

Argument with return

Function takes argument and return result. 

Example

int sum(int,int);

void main()

{

     int a,b,c;

     printf("Enter two number>> ");

     scanf("%d%d",&a,&b);

     printf("\t\n%d",sum(a,b));

}

int sum(int a,int b)

{

     return(a+b);

}

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