Why I am getting error while concatenating variables in output in C++?

Question

I am trying to concatenate output variables in C++ In my code there are some calculations and when I am printing the output of the variables I am getting error.

My code:

#include<iostream>
#include<string>
#include<math.h> 
using namespace std;

int main()
{
   
       string name;
       cout<<"Enter the name of the borrower: ";
       cin>>name;

       float mortage_blanace;
       cout<<"Enter the mortage balance: ";
       cin>>mortage_blanace;

       float interest_rate;
       cout<<"Enter the annual interest rate: ";
       cin>>interest_rate;

       float current_monthly_payment;
       cout<<"Enter the current monthly payment: ";
       cin>>current_monthly_payment;

       float extra_monthly_payment;
       cout<<"Enter the extra monthly payment: ";
       cin>>extra_monthly_payment;

       cout<<"\n"; 

       int new_payment = current_monthly_payment+extra_monthly_payment;
       float i = (interest_rate/100)/12;
       int current_duration_in_months =  (log(current_monthly_payment/(current_monthly_payment/i)-mortage_blanace))/(log(1+i));
       int new_duration_in_months = (log(new_payment/(new_payment/i)-mortage_blanace))/(log(1+i));
       float current_interest = (current_monthly_payment*new_duration_in_months)-mortage_blanace;
       float new_interest = (new_payment*new_duration_in_months)-mortage_blanace;
       int current_duration_years = current_duration_in_months/12;
       int current_duration_months = current_duration_in_months%12;
       int new_duration_years = new_duration_in_months/12;
       int new_duration_months = new_duration_in_months%12;
       float savings = current_interest-new_interest;
       string fees;
       
       cout<<mortage_blanace + "      " + mortage_blanace;
       cout<<"\n";

   } 
     
    return 0;
}

But I am getting following error:

Untitled1.cpp: In function 'int main()':
Untitled1.cpp:58:30: error: invalid operands of types 'float' and 'const char [7]' to binary 'operator+'
        cout<<mortage_blanace + "      " + mortage_blanace;

How can I get concatenated output in C++ like the one I want?!

Any help is appreciated.

why not just cout<<mortage_blanace << " " << mortage_blanace;? Instead of trying to concatenate a float with an array of characters. — Tanner Dolby
– Tanner Dolby, Commented Nov 20, 2021 at 18:55

Tanner Dolby · Accepted Answer · 2021-11-20 19:11:36Z

2

You can use the insertion operator (<<) to display values to standard output instead of trying to concatenate a float with an array of characters.

cout << mortage_blanace << "      " << mortage_blanace << endl;

edited Nov 20, 2021 at 19:11

answered Nov 20, 2021 at 19:03

Tanner Dolby

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Comments

ChaKu · Accepted Answer · 2021-11-20 19:15:43Z

0

You cannot use string concatenation, i.e. + directly for a float and a std::string. You can use insertion operator as Tanner Dolby said or if you need to use + you can convert the float value to std::string using std::to_string. You can then use string concatenation.

       cout<<to_string(mortage_blanace) + "      " + to_string(mortage_blanace);
       cout<<"\n";

answered Nov 20, 2021 at 19:15

ChaKu

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