Question -
Answer -
Call By Value : In call by value method, the called function creates its own copies of original values sent to it. Any changes that are made, occur on the function’s copy of values are not reflected back to the calling function.
Call By Reference : In call by reference method, the called function accesses and works with the original values using their references. Any changes that occur, takes place on the original values and are reflected back to the calling code.
Example:
| //using call by reference #include void swap(int &, int &); int main() { int a=10,b=20; swap(a,b); cout< return 0; } void swap(int &c, int &d) { int t; t=c; c=d; d=t; } output : 20 10 | //using call by value #include void swap(int, int); int main() { int a=10,b=20; swap(a,b): cout< return 0; } void swap(int c, int d) { int t; t=C; C=d; d=t; } output: 10 20 |