Difference between call by value and call by reference?

Call by Value	Call by Reference
1) In this actual copy of arguments is passed to formal arguments.	1) In this location of actual arguments is passed to formal arguments.
2) Any changes made are not reflected in the actual arguments.	2) Any changes made are reflected in the actual arguments.
3) It can only be implemented in C, as C does not support call by reference.	3) It can only be implemented in C++ and JAVA.
4) Actual arguments remain preserved and no chance of modification accidentally.	4) Actual arguments will not be preserved.
5) It works locally.	5) It works globally
#include <stdio.h> void swapByValue(int, int); /* Prototype */ int main() /* Main function */ {   int n1 = 10, n2 = 20;   /* actual arguments will be as it is */   swapByValue(n1, n2);   printf("n1: %d, n2: %d\n", n1, n2); } void swapByValue(int a, int b) {   int t;   t = a; a = b; b = t; } OUTPUT ====== n1: 10, n2: 20	#include <stdio.h>   void swapByReference(int*, int*); /* Prototype */   int main() /* Main function */ {   int n1 = 10, n2 = 20;     /* actual arguments will be altered */   swapByReference(&n1, &n2);   printf("n1: %d, n2: %d\n", n1, n2); }   void swapByReference(int *a, int *b) {   int t;   t = *a; *a = *b; *b = t; }   OUTPUT ====== n1: 20, n2: 10