Answer Posted / anilkumar.s

#include<iostream.h>
class call
{int a,b;
void callbyvalue(int x,int y)
{ a=x;
b=y;
int c;
c=a;
a=b;
b=c;
}
void callbyreference(int *x,int *y)
{
a=x;
b=y;
int *t;
t=a;
a=b;
b=t;
}
void display()
{
cout<<" a=" <<a<<" "<<"b="<<b;
}
void main()
{
call o;
o.callbyvalue(10,20)//value can't be swap
o.callbyreference//value can be swaP

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