Multiplying string by a const int C++

Question

#include <iostream>
#include <string>
using namespace std;


int main() {
   
   //declaring cin inputs
   string userName;
   string userMiles;
   string userSteps;
   
   
   //declaring constant for number of steps/mile
   const int stepsPerMile = 2000;   
      
      //getting user's name
      cout << "What is the user's name?";
      cin >> userName;
      cout << endl;
      
      //getting miles walked
      cout << "How many miles did " << userName << " hike today?";
      cin >> userMiles;
      cout << endl;
      
      //getting other steps taken
      cout << "How many other steps did " << userName << " take today?";
      cin >> userSteps;
      cout << endl;
      
   string stepsTakenFromMiles;
   string totalSteps;
      
   stepsTakenFromMiles = userMiles * stepsPerMile;
   totalSteps = stepsTakenFromMiles + userSteps;
   
      cout << userName << " took " << totalSteps << " steps throughout the day." << endl;
      
   return 0;
}

I am trying to multiply userMiles (string) by stepsPerMile (const int) and I keep getting an error that they are not matching operand types. I have to use stepsPerMile as a const int and cannot change it. How do I change my code to allow both of these inputs to be multiplied?

Answer 1

Read in userMiles and userSteps as integers, not as strings. operator>> can read in many different types, not just std::string. Try using int instead, to match your stepsPerMile constant, eg:

#include <iostream>
#include <string>
using namespace std;

int main() {
   
   //declaring cin inputs
   string userName;
   int userMiles;
   int userSteps;
   
   //declaring constant for number of steps/mile
   const int stepsPerMile = 2000;   
      
   //getting user's name
   cout << "What is the user's name?";
   cin >> userName;
   cout << endl;
      
   //getting miles walked
   cout << "How many miles did " << userName << " hike today?";
   cin >> userMiles;
   cout << endl;
      
   //getting other steps taken
   cout << "How many other steps did " << userName << " take today?";
   cin >> userSteps;
   cout << endl;
      
   int stepsTakenFromMiles;
   int totalSteps;
      
   stepsTakenFromMiles = userMiles * stepsPerMile;
   totalSteps = stepsTakenFromMiles + userSteps;
   
   cout << userName << " took " << totalSteps << " steps throughout the day." << endl;
      
   return 0;
}

Demo