Call by Value and Call by Reference

Lokesh M · #1 (**permalink**) 07-06-2006

Call by Value and Call by Reference

In this tutorial you will learn about C Programming - What is difference between call by value and call by reference in function?

The arguments passed to function can be of two types namely

1. Values passed
2. Address passed

The first type refers to call by value and the second type refers to call by reference.

For instance consider program1

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timmy · #2 (**permalink**) 07-12-2006

It was useful information about passing arguments to functions. In call by value argument gets passed as variables and in call by reference address gets passed. Does it mean if we use call by reference the execution time would be faster for the function since we the address gets accessed directly. If not why is it so?

mohshha · #3 (**permalink**) 06-23-2009

call by value:

fun(5);

call by reference

fun(&a);

definition call by value

int fun(int a)
{
int b;
b= a+ 2;
return(b);
}

call by reference

int fun(int *a)
{
b=(*a )+ (*a)
return b;
}

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