Change/return more than value from function | C Language

Q : Write down three different methods used for referencing multiple values from a function.

Answer : you can return only one value from function using return statement but you can change multiple values from a function using a pointer, array, and structure. The following program will show you a demo. 

#include<stdio.h>

#include<conio.h>

#include "mylib.h"

/*============================

     Girfa Student Help

     Multiple value set from function

==============================*/

struct data

{

     int roll;

     int marks;

};

void swap(int*,int*);

void setzero(int[]);

void change_struct(struct data*);

void main()

{

  int a=10,b=20;

  int ar[5]={1,2,3,4,5};

  struct data ob={101,50};

  clrscr();

  swap(&a,&b);

  printf("\n1. By Pointer A=%d,B=%d",a,b);

  setzero(ar);

  printf("\n2. Printing array changed value\n");

  for(a=0;a<5;a++)

     printf("\t%d",ar[a]);

  change_struct(&ob);

  printf("\n3. Printing changed struct value Roll=%d,Marks=%d",ob.roll,ob.marks);

  getch();

}

void change_struct(struct data *ob)

{

     ob->roll=0;

     ob->marks=0;

}

void setzero(int ar[])

{

     int i;

     for(i=0;i<5;i++)

           ar[i]=0;

}

void swap(int *a,int *b)

{

     int tmp;

     tmp=*a;

     *a=*b;

     *b=tmp;

}

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