Question

The function used in the following program is supposed to take 2 parameters (arguments) and switch the contents of the 2 and send them back to the calling program, but the values are not swapped and both have the same number in them. Select the option that fixes the problem?

void interchange(int &arg1, int &arg2) {
      arg2 = arg1;
      arg1 = arg2 ;
}
int main() {
      int        num1 = 4 , num2 = 5;
      interchange(num1, num2);
      cout << "Number 1 : " << num1 << endl;
      cout << "Number 2 : " << num2 << endl ;
  return 0;
}

1. Need to replace the code with the following

int temp = arg1;
arg1 = arg2 ;
arg1 = temp ;

2. interchange (&num1, &num2) ; // function call

3. None of the given choices is correct

4. int interchange(int & arg1, int & arg2) // function heading

  interchange (&num1, &num2) ; // function call

5. int interchange(int arg1, int arg2) // function heading

Answer 1

1. Need to replace the code with the following

int temp = arg1;
arg1 = arg2 ;
arg1 = temp ;