Differentiate between call by value and call by reference concept by giving c program.

Differentiate between call by value and call by reference concept by giving c program.

                   

#include<stdio.h>

#include<conio.h>

void swap1(int,int);

int swap2(int*,int*);

void main()

{

int n1,n2;

clrscr();

printf("\n Enter any two values for swap--");

scanf("%d%d",&n1,&n2);

printf("\n Before swap the value-\n\n");

printf("N1=%d  ,N2=%d",n1,n2);

//Call by value

swap1(n1,n2);

swap2(&n1,&n2);

printf("\n After swap the value by reference-\n\n");

printf("N1=%d  ,N2=%d",n1,n2);

getch();

}

void swap1(int a,int b)

{

a=a+b;

b=a-b;

a=a-b;

printf("\n After swap the value by using call by value-\n\n");

printf("N1=%d  ,N2=%d",a,b);

}

int swap2(int *a,int *b)

{

int temp;

temp=*a;

*a=*b;

*b=temp;

return 0;

}

output:

Enter any two values for swap--45 10

Before swap the value-

N1=45  ,N2=10

 After swap the value by using call by value-

N1=10  ,N2=45

After swap the value by reference-N1=10  ,N2=45