Answers ( 1 )

  1. sahebali
    sahebali
    14 Mar 2025

    In programming, Call by Value and Call by Reference are two different ways of passing arguments to functions.

    1. Call by Value

    In Call by Value, a copy of the actual parameter is passed to the function.  Any changes made to the parameter inside the function do not affect the original value.

    Example in C programming:

    #include <stdio.h>
    void changeValue(int x) {
        x = 20;  
    }

    int main() {
        int a = 10;
        printf("Before function call: %d\n", a);
        changeValue(a);  
        printf("After function call: %d\n", a);
        return 0;
    }

    The function changeValue() modifies the value of x, but since x is a copy of a, the original a remains unchanged.

    2. Call by Reference

    In Call by Reference, the function receives a reference or address of the actual parameter.  Any changes made inside the function directly modify the original variable.

    Example

    #include <stdio.h>
    void changeValue(int *x) {
        *x = 20;
    }

    int main() {
        int a = 10;
        printf("Before function call: %d\n", a);
        changeValue(&a);  
        printf("After function call: %d\n", a);
        return 0;
    }

    The function change Value() takes a pointer to x, which holds the address of a. Modifying *x changes the actual value of a, as the function operates directly on its memory location.

    0

Leave an Answer


lyciru

Ask by lyciru

 Prev question

Next question