Answer Posted / shrikant patil

Call by value method:
passing the value of variable to the function.
void main()
{
int x=10,y=20;
printf("%d%d',x,y);
swap(x,y);
}
void swap(int a,int b)
{
int c;
c=a;//changes here do not affect in values
a=b;//of x and y in main function..
b=c;
}

call by reference method:
passing the address of variable to the function.
swap(&a,&b)
&c=&a;
&a=&b;
&b=&c;
changes made in subfunction causes changes in address of
variables n thus in main () also..

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