Creating a very basic calculator in C++

June 21, 2022

I’m extremely new to C++, I was following a tutorial and wanted to go a bit off what the course said, I attempted to make a basic calculator that instead of just being able to add could subtract, divide and multiply but it still seems to only be able to add, why is this?

  int num1, num2;
  double sum;
  int addType;
  cout << "Type a number: ";
  cin >> num1;
  cout << "Type a second number: ";
  cin >> num2;
  cout << "Do you want to 1. add, 2. subtract, 3. divide or 4. multiply: ";
  cin >> addType;
  if (int addType = 1) {
    sum = num1 + num2;
  }
  else if (int addType = 2) {
    sum = num1 - num2;
  }

  else if (int addType = 3) {
    sum = num1 / num2;
  }
  else if (int addType = 4) {
    sum = num1 * num2;
  }
  
  cout << "Your total is: " << sum;
  
}

>Solution :

You are creating new variable in if condition part, update condition part to check if it is equal to something with addType == x

int num1, num2;
 double sum;
 int addType;
 cout << "Type a number: ";
 cin >> num1;
 cout << "Type a second number: ";
 cin >> num2;
 cout << "Do you want to 1. add, 2. subtract, 3. divide or 4. multiply: ";
 cin >> addType;
 if (addType == 1) {
   sum = num1 + num2;
 }
 else if (addType == 2) {
   sum = num1 - num2;
 }

 else if (addType == 3) {
   sum = num1 / num2;
 }
 else if (addType == 4) {
   sum = num1 * num2;
 }
 
 cout << "Your total is: " << sum;
 
}