FAQ: Loops - Introduction to Loops

This community-built FAQ covers the “Introduction to Loops” exercise from the lesson “Loops”.

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I’m stuck, I need help. I know this isn’t apart of the exercise, but my calculator is only returning the actual third number of what I inputted, not the difference. If you run this code, you’ll see exactly what I’m talking about. Note: Please input “+” as your first operator, because that’s the part I’m working on and then “-”.


using namespace std;

int main() {
char op;
char opS;
double num1;
double num2;
double num3;

// Title
std::cout << "-Calculator-\n";

std::cout << "Enter your first number.\n";
std::cin >> num1;

std::cout << "Enter either of these operators: +, -, /, or *\n";
std::cin >> op;

std::cout << "Enter your second number.\n";
std::cin >> num2;

double storedNum1;

    case '+':
        std::cout << "Answer:\n"<< num1+num2;
        std::cout << "\n* , /, + or - this number? If not, enter 'exit'\n";
        std::cin >> opS;
        case '-':
		std::cout << "Enter your third number.";
		std::cin >> num3;
		std::cout << num3-storedNum1 << " is the answer.";

    case '-':
        std::cout << "Answer:\n" << num1-num2;

    case '*':
        std::cout << "Answer:\n" << num1*num2;

    case '/':
        std::cout << "Answer:\n" << num1/num2;


        std::cout << "Operator isn't valid. Try again.\n";
char c;
std::cin >> c;
return 0;


1 Like

Btw I can say your code is messed up little a bit. What do you mean by num1+num2==storedNum1; ? I think you are trying to sum num1 and num2 and then assign to a variable storedNum1 but that’s not the right way of doing it. You can do this storedNum1 = num1 + num2;

Also, I will suggest you go through lvalue & rvalue topics

1 Like

here I guess you mean storedNum1 = num1+num2;