Calculator Errors

[Shadowtrixer]

I'm trying to make a small calculator.
First I have to choose + or - and then I will enter the numbers...
When I select - using number 2 it wont go directly to - , it goes to + first.

(sais illegal else)

#include <iostream>

int main()

{
	int stop;
	int n1;
	int n2;
    int subadd;
	int n3;
	int n4;

	std::cout << "Enter 1 for addition or 2 for substraction" << std::endl;
	std::cin >> subadd;

if(subadd==1)
	std::cout << "Please enter the first number" << std::endl;
	std::cin >> n1;

std::cout << "Please enter the second number" << std::endl;
	std::cin >> n2;

std::cout << n1 << " + " << n2 << " = " << n1+n2 << std::endl;

else
	std::cout << "Please enter the first number" << std::endl;

	std::cin >> n3;

std::cout << "Please enter the second number" << std::endl;
	std::cin >> n4;

std::cout << n3 << " - " << n4 << " = " << n3-n4 << std::endl;

std::cin >> stop;
}

[TwilightSpectre]

You need to put braces around the contents of your if statements, otherwise they only go for one line. Do it like this:

// ...
if (subadd == 1) {
    std::cout << "..." << std::endl;
    // ...
} else {
    std::cout << "..." << std::endl;
    // ...
}

std::cin >> stop;