Program for SWAPING OF 2 NUMBERS USING CALL BY VALUE ,CALL BY REFERENCE

#include<stdio.h>

#include<conio.h>

swap(int x,int y);

swap(int *x,int *y);

main()

{           int a,b,ch;

            clrscr();

            printf("ENTER A,B VALUES\n");

            scanf("%d%d",&a,&b);

            printf("BEFORE SWAPPING \n");

            printf("A=%d,B=%d\n",a,b);

            printf("1:USING CALL BY VALUE \n 2:USING CALL BY REFERENCE\n");

            scanf("%d",&ch);

            switch(ch)

            {

                        case 1:swap(a,b);

                                     break;

                        case 2:

swap(&a,&b);

                                     break;

                        default:

printf("INVALID");

            }

            printf("AFTER SWAPPING \n");

            printf("A=%d,B=%d\n",a,b);

            getch();

}

swap(int a,int b)

{

                        int temp;

                        temp=a;

                        a=b;

                        b=temp;

}

swap(int *x,int *y)

{

                        int temp;

                        temp=*x;

                        *x=*y;

                        *y=temp;

}

OUTPUT :

            ENTER A,B VALUES  10  20

            BEFORE SWAPPING        A=10   B=20

            1:USING CALL BY VALUE

            2:USING CALL BY REFERENCE

            2

            AFTER SWAPPING

            A=20

            B=10