Calculator based on switch statement : switch « Operators statements « C++ Tutorial

1. C++ Tutorial
2. Operators statements
3. switch

#include <iostream>

int   result;     
char  oper_char;   
int   value;      

int main()
{
    result = 0;                

    while (true) {
       std::cout << "Result: " << result << '\n';
       std::cout << "Enter operator and number: ";
    
       std::cin >> oper_char >> value;
    
       if ((oper_char == 'q') || (oper_char == 'Q'))
           break;
    
       switch (oper_char) {
           case '+':
               result += value;
               break;
           case '-':
               result -= value;
               break;
           case '*':
               result *= value;
               break;
           case '/':
               if (value == 0) {
                   std::cout << "Error:Divide by zero\n";
                   std::cout << "   operation ignored\n";
               } else
                   result /= value;
               break;
           default:
               std::cout << "Unknown operator " << oper_char << '\n';
               break;
       }
    }
    return (0);
}