Call by value and Call by reference in C are two ways to pass arguments in a function Lets see above one by one Call by value Whenever we call a function and passes the value of variable to the called function is called call by value.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #include <stdio.h> void swap(int x, int y); /* function declaration */ int main () { int a = 10; int b = 20; printf("Value of 'a' before swap= %d\n", a ); printf("Value of 'b' before swap= %d\n", b ); swap(a, b); // calling a function swap & passes the value of variable printf("Value of 'a' after swap= %d\n", a ); printf("Value of 'b' after swap= %d\n", b ); return 0; } void swap(int x, int y) // function definition to swap the values { int temp; temp = x; x = y; y = temp; return; } |
OUTPUT
| Value of 'a' before swap= 10 Value of 'b' before swap= 20 Value of 'a' after swap= 10 Value of 'b' after swap= 20 |
Call by reference Whenever we … Read more