#include <stdio.h>
#include <stdlib.h>
main()
{
int num=0,i;
int temp;
int a=10,b=100,c=200,d=300,e=400,f=500;
for(i=0;i<=4;i++)
{
printf("a. for a<->b :\n");
printf("b. for a<->c :\n");
printf("c. for a<->d :\n");
printf("d. for a<->e :\n");
printf("e. for a<->f :\n\n");
printf("Please enter your choice :");
scanf("%d",&num);
switch (num)
{
case 1:
temp=a;
a=b;
b=temp;
printf("a-->%d b--> %d\n",a,b);
break;
case 2:
temp=a;
a=c;
c=temp;
printf("a-->%d c--> %d\n",a,c);
break;
case 3:
temp=d;
d=a;
d=temp;
printf("a-->%d d--> %d\n",a,d);
break;
}
a=10;
}
system("pause");
return 0;
}