Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 
  • PASSING ARGUMENT TO A FUNCTION BY REFERENCE IN C

    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 260
    Comment on it

    Passing argument to a function by reference is also know as call by reference. In this method if we change the parameter given in the function will effect the argument. For passing a value by reference, we use pointers. As we use pointers in call by reference, so arguments address are passed rather than the value.

    Below is the example of how to pass argument by reference.

    // function definition for swapping two  integer type values a and b
    void swap(int *a, int *b) 
    {      
       int t;
       t = *a;                                    // save the value at address a into t variable
       *a = *b;                                    // we put value of b into a 
       *b = t;                                     // put t into b 
       return;
    }
    Now, we call the function swap() by passing original values . 
    #include <stdio.h>
    void swap(int *a, int *b);    
    int main () {
       int x = 5;   //    local variable definition 
       int y = 6;
       printf("Before swap, value of x : %d\n", x );
       printf("Before swap, value of y : %d\n", y );
       //  Now we are calling a function to swap two values 
        swap(x, y);
       printf("After swap value of x : %d\n", x );
       printf("After swap value of y : %d\n", y );
       return 0;
    }
    
    **OUTPUT**
        Before swap value of x :5
        Before swap value of y :6
        After swap value of x :6
        After swap value of y :5
    

    This shows that if we change parameter which are given inside a function will effect the argument

 0 Comment(s)

Sign In
                           OR                           
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: