Let us understand the difference between pass by value and pass by reference in C. Given below is a simple C program that illustrates the difference between ordinary arguments, which are passed by value, and pointer arguments, which are passed by reference. #include<stdio.h> void funct1(int a, int b); /*function prototype*/ void funct2(int *pa, int *pb); /*function prototype*/ void main() { int a = 1; int b = 3; printf(“\nBefore calling funct1: a=%d b=%d”, a, b); funct1(a, b); printf(“\nAfter calling funct1: a=%d b=%d”, a, b); printf(“\nBefore calling funct2: a=%d b=%d”, a, b); funct2(&a, &b); printf(“\nAfter calling funct2: a=%d b=%d”, a, b);...