Question

void searchFlight(cust flights[] ,int row)
{    
    clrscr();
    cout << "Search for the flight you are looking for.\n";

    string airport;

    cout << "Enter Departing Flight : ";
    cin >> airport;   //error

    for (int r=0;r<row;r++)
    {
        if (strnicmp(airport, flights[r].airport[20], strlen(airport) ==0) //error  
        {
            clrscr();
            cout << flights[r].name[20] <<endl;
            cout << flights[r].airport[20] <<endl;
            cout << flights[r].destination[20] <<endl;
            cout << flights[r].ticket <<endl;
            cout << flights[r].passangers <<endl;
            cout << flights[r].opCost <<endl;
            cout << flights[r].income <<endl;
            cout << flights[r].netProfit <<endl;;
            pressKey();
        }
    }
    pressKey();
}

For the cin error:
error C2678: binary ‘>>’ : no operator found which takes a left-hand operand of type ‘std::istream’ (or there is no acceptable conversion)

For the strnicmp error:
error C2664: ‘strlen’ : cannot convert parameter 1 from ‘std::string’ to ‘const char *’

I have searched for solutions to this problem and could not fix it. Apologies if there is a similar post on here which could have solved my problems.

Answer 1

For the cin error: error C2678: binary ‘>>’ : no operator found which takes a left-hand operand of type ‘std::istream’ (or there is no acceptable conversion)

Add #include <string> to your CPP file.

For the strnicmp error: error C2664: ‘strlen’ : cannot convert parameter 1 from ‘std::string’ to ‘const char *’

Confirm that you have #include <cstring> to your CPP file, and replace your call with:
strnicmp(airport.c_str(), flights[r].airport[20], strlen(airport.c_str()) ==0.

I suspect that flights[r].airport[20] is also incorrect, but I can’t know because you didn’t post a complete program.

If cust::airport is declared like std::string airport;, then you need flights[r].airport.c_str().

If cust::airport is declared like char airport[20];, then you need flights[r].airport.