Still need c++ help?

ok this is the word problem





Hulk Hogan invests in a Roth IRA. He plans to put $200 in the account on the first of each month, beginning on Jan 1, 2007. His last payment will be on Dec 1, 2036. His money earns a (% annual interest rate, compounded monthly. Calculate and print his balance on January 1 of each year, from 2007 until 2037. Do not print the other months.








this is wut i have so far





//this program calculates the 9% annual interest


//of an IRA account compounded monthly then prints


//out every january 1st for 30 years.








#include %26lt;iostream%26gt;


#include %26lt;iomanip%26gt;


#include %26lt;cmath%26gt;


using namespace std;


int main()


{





cout%26lt;%26lt;"This is the program of : ";


cout%26lt;%26lt;"Dillon Nicholson"%26lt;%26lt;"\n";


cout%26lt;%26lt;"CMPS 1043-02"%26lt;%26lt;"\n";


cout%26lt;%26lt;"Due date:";


cout%26lt;%26lt;" Oct 30 2007"%26lt;%26lt;"\n"%26lt;%26lt;"\n";





double principal = 200.00;


double amount;


double rate = (1 + .09/12) * 12;








cout %26lt;%26lt; "January 1st of year" %26lt;%26lt; setw( 21 ) %26lt;%26lt; "Amount on deposit" %26lt;%26lt;endl;


cout %26lt;%26lt; fixed %26lt;%26lt; setprecision( 2 );

Still need c++ help?
to print some thing in a file, do this:





//add the library of file


#include%26lt;fstream%26gt;





//initialize an output file


ofstream out; // or any other name like outFile





//open the file


out.open("SomeFileName.SomeFormat") //like out.open("output.txt")





//then use out instead of cout in any line like replace this





cout %26lt;%26lt; "January 1st of year" %26lt;%26lt; setw( 21 ) %26lt;%26lt; "Amount on deposit" %26lt;%26lt;endl;


cout %26lt;%26lt; fixed %26lt;%26lt; setprecision( 2 );





//replace above with





out %26lt;%26lt; "January 1st of year" %26lt;%26lt; setw( 21 ) %26lt;%26lt; "Amount on deposit" %26lt;%26lt;endl;


out %26lt;%26lt; fixed %26lt;%26lt; setprecision( 2 );





//this way the result is printed in a file





//finally close the file


out.close()
Reply:Look carefully at your pow() function call. You're adding 1.00 to rate, but rate already had a 1 factored in back when it was defined.





Note that I'm hardly up on compound interest enough to verify your overall calculations.





Hope that helps.