I Tried to do this coding, next to the question Is my code. I don't know why the code doesn't work. Please help! How do I get c++ to ignore the spaces. What am I doing wrong? We want to make a simple calculator that can add and subtract integers...

//We want to make a simple calculator that can add and //subtract inte//gers and will accept arbitrarily //long mathematical formula composed //of symbols +, -, and non-negative integer numbers. //100+5025+0+123-1 #include #include #include #include # include #include using namespace std; int main() { //sets sum to 0 int sum = 0; char ch = '+'; int operand; string formula; while (getline(cin, formula)) { if(ch { sum -= operand;} else if(ch '+'){ sum += operand;} else { sum -= operand;} } cout sum