Thread: operator!= and primary-expression error : First time poster

Hi, I'm looking for a program that uses parallel one-dimensional arrays so when a user inputs the product ID, they have displayed the quantity and the price.

Here is my code so far:

Code:

#include <iostream>

using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::transform;

int main()
{    
    //declare arrays
    string searchId   = " ";
    int ids[5]        = {10, 14, 34, 45, 78};
    int prices[5]     = {125, 600, 250, 350, 225};
    int quantities[5] = {5, 3, 9, 10, 2};


//get id to search for, then convert to uppercase
      cout << "Enter ID (X to exit): ";
      getline (cin, searchId);
      transform (searchId.begin(), searchId.end(), searchId.begin(), toupper);
      
      while (searchId != "X")
      {
            //locate position of product ID in the ids array
            int y = 0; //keeps track of array subcripts
            while (y < 5 && ids[y]  != searchId)
                  y += 1;
            //end while
            
            //if ID was found, display price from prices array     
            if (y < 5)
                cout << "Price for product ID: " << ids[y]
                     << ": $" << prices[y] << endl << endl;

               //then display quantity from the quantities arry
               cout << "Quantit for product ID: " << ids[y]
                     << ": " << quantities[y] << endl << endl;

            //If ID not found, display error message
            else
                cout << "Invalid product ID" << endl << endl;
            //end if    


            //get ID to search for, then convert to uppercase
            cout << "Enter ID (X to exit): ";
            getline (cin, searchId);
            transform (searchId.begin(), searchId.end(), searchId.begin(), toupper); 

         } //end while

    return 0;
}   //end of main function

My problem is

Code:

 while (y < 5 && ids[y]  != searchId)

is getting a no match for 'operator!+' in 'ids[y]!=searchId'

My second problem is

Code:

else

is getting an expected primary-expression before "else". I do have a ( at the end of the line above else..

If anyone can help me, or point me in the right direction, that would be awesome. Ive only been coding for about a month.

Thanks again

Originally Posted by grumpy

ids[y] is of type int. searchID is of type std::string. There is no defined way to compare equality of an int and a std::string. Hence the "no match" error for operator!=

Thanks so much!

I changed from string to an int and made some small changes to compensate, and it all works...

Very much appreciated your help!