error: invalid operands of type 'double' and 'double' to binary operator

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I was trying to do the following problem but I keep getting the error of invalid operands of type double and double to binary operator. I've switched everything I can think of with my super-limited abilities and still can't fix the error. Can anyone help me? (I posted the question at the very bottom that I am doing the code for). Thank you very much to anyone who can help

*edit* I noticed when i switch the double with int the code works but i need to be able to use decimal points.the same error happens to me when i use float

C++

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

/*
 * 
 */
int main(int argc, char** argv) {
    double principal1;
    double rate;
    double T;
    double amount;
    cout << "Enter principal1: ";
    cin >> principal1;
    cout << "Enter rate: ";
    cin >> rate;
    cout << "Enter times compounded annually: ";
    cin >> T;
    amount=(principal1)*((1+(rate/T))^T);
    cout << "The total amount is : " << amount << endl;
    
    return 0;
}

Assuming there are no deposits other than the original investment, the balance in a savings account after one year may be calculated as
Amount = Principal*(1 + Rate/T)^ T
Principal is the balance in the savings account, Rate is the interest rate, and T is the number of times the interest is compounded during a year (T is 4 if the interest is compounded quarterly).
Write a program that asks for the principal, the interest rate, and the number of times the interest is compounded. It should display a report similar to
Programming Challenges 145
Interest Rate:4.25
Times Compounded: 4
Principal:1000
Interest:43.34
Amount in Savings:1043.34

Posted 13-Sep-15 8:05am

Member 11980875

Updated 13-Sep-15 9:34am

CPallini

v5

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Comments

Alan N 13-Sep-15 15:17pm

HINT: 1) In the question what does the ^ operator do? 2) In C++ what does the ^ operator do?

Sergey Alexandrovich Kryukov 13-Sep-15 15:29pm

Reading a reference could way faster than asking a question...
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-09-13T09:28:00

Solution 1

You did not show the line where the compilation error is. There is an error in the line amount=(principal1)*((1+(rate/T))^T); you cannot use XOR ^ operator here. If you meant to use power function, please use: http://www.cplusplus.com/reference/cmath/pow[^].

See also:
https://msdn.microsoft.com/en-us/library/3akey979.aspx[^].

It's very counter-productive to write code without reading on the basics of the language you use. Isn't it so easy to consult some reference Web page (MSDN, in this case) or a book? My advice is to get to programming seriously.

—SA

Posted 13-Sep-15 9:28am

Sergey Alexandrovich Kryukov

Updated 13-Sep-15 16:26pm

v4

Comments

CPallini 13-Sep-15 15:35pm

Indeed. 5.
Please note, there's no need of System.Math.Pow, standard C++ provides the pow function.

Sergey Alexandrovich Kryukov 13-Sep-15 22:28pm

Thank you, Carlo.
Sure, Afzaal already fixed my two links.
—SA

Afzaal Ahmad Zeeshan 13-Sep-15 16:43pm

5ed; good catch.

Plus, I made the change as to what Carlo has said above and the program is also C++ so I changed the function call, resource links. Hope, I didn't mess up with the quality of your answer. :-)

Sergey Alexandrovich Kryukov 13-Sep-15 22:28pm

Thank you very much, Afzaal, especially for fixing my references; I only streamlined the phrasing a bit,
—SA

Wendelius 13-Sep-15 23:22pm

Good eyes :)

Sergey Alexandrovich Kryukov 14-Sep-15 3:05am

Thank you, Mika.
—SA

Member 11980875 · Accepted Answer · 2015-09-13T16:00:00

Thank you , i switched my code to the following and made it work. I was unfamiliar with exponents and now I'm good with them

#include <cstdlib>
#include <iostream>
#include <cmath>
using namespace std;

/*
*
*/
int main() {
float principal1; //starting principal
float rate; //interest rate
float T; //times compounded annually
float amount; //final amount in account
float helper;
cout << "Enter principal1: ";
cin >> principal1;
cout << "Enter rate: ";
cin >> rate;
cout << "Enter times compounded annually: ";
cin >> T;
helper=(1+(rate/T)); /*I didn't know how to properly use exponents with this so i made a helper variable thing */
amount=(principal1)* pow(helper,T);
cout << "The balance after a year is : " << amount << endl;

return 0;
}