Reference Variable

&variable returns the address of the variable.

There are 3 types of calls. 1. Call by Value 2. Call by Pointer 3. Call by Reference

Call by Value

int main () {
    int val = 5;
    func(val);
    return 0;
}

void func (int para_var) {
    para_var++;
}

Call by Pointer

int main () {
    int val = 5;
    func(&val);
    return 0;
}

void func (int *para_var) {
    *(para_var)++;
}

Call by Reference

int main () {
    int val = 5;
    func(val);
    return 0;
}

void func (int &para_var) {
    para_var++;
}