# include <iostream> using namespace std;  int main() {     char op;     float num1, num2;      cout<<"Enter First Number:";     cin>>num1;     cout << "Enter operator either + or - or * or /: ";     cin >> op;      cout << "Enter second number: ";     cin>> num2;      switch(op)     {         case '+':             cout << num1+num2;             break;          case '-':             cout << num1-num2;             break;          case '*':             cout << num1*num2;             break;          case '/':             cout << num1/num2;             break;          default:             // If the operator is other than +, -, * or /, error message is shown             cout << "Error! operator is not correct";             break;     }      return 0; }