About Lesson
Call By Value
if any change in formal parameter it does not affect actual parameter.
Call By Reference
if any change in formal parameter it affects actual parameter
C
#include<stdio.h>
/*
Call By Value
if any change in formal parameter
it does not affect actual paramater
*/
void fun(int);
int main() //calling function
{
int a=10;
printf("\nBefore call of fun A=%d",a);
fun(a); // a is actual parameter
printf("\nAfter Call of Fun A=%d",a);
return 0;
}
void fun(int x) // x is formal parameter
{
x=100;
}C
#include<stdio.h>
/*
Call By Reference
if any change in formal parameter it
affects actual paramater
*/
void fun(int*);
int main()
{
int a=10;
printf("\nBefore call of fun A=%d",a);
fun(&a); // a is actual parameter
printf("\nAfter Call of Fun A=%d",a);
return 0;
}
void fun(int *x) // x is formal parameter
{
*x=100;
}
/*
Swaping of 2 nos using call by reference
*/