Explain the concept of call by reference, with suitable code in C for each. Give advantage and disadvantage of call by reference

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In C programming, the concept of "call by reference" allows a function to modify the value of a variable in the calling code by passing its memory address instead of the actual value. This means that any changes made to the parameter within the function will affect the original variable outside the function.

To demonstrate this concept, let's consider an example using a swap function to interchange the values of two integers.

 #include <stdio.h> void swap(int *a, int *b) {     int temp = *a;     *a = *b;     *b = temp; } int main() {     int x = 10;     int y = 20;          printf("Before swap: x = %d, y  _____ _________ __ __________ ________ _______ _____________.
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Degree : PG DIPLOMA PROGRAMMES
Course Name : POST GRADUATE DIPLOMA IN COMPUTER APPLICATIONS
Course Code : PGDCA_NEW
Subject Name : Programming in C and PYTHON
Subject Code : MCS 201
Year : 2023