using pow function in an expression [closed]

Question

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.

Closed 9 years ago.

#include <iostream>
#include <string>
#include <iomanip>
#include <cmath>

// Defining Variable

using namespace std;

const int MONTHS_IN_YEAR = 12; 
const int PURCHASE_PRICE= 123500;
const int AMOUNT_MORG= 111150;
const int DOWN_PAYMENT =  12350;
const float MONTHLY_RATE= 0.542f;
const float FORMULA_RATE=1.542f;
float PAYMENT;
int main()




{

PAYMENT= (float)(MONTHLY_RATE*AMOUNT_MORG)*(pow(1.542,180));
cout << PAYMENT;

cout <<  fixed << showpoint << setprecision(2);


system ("cls");
cout <<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"; 
cout <<'$';
cout << setw(79)<<'$';
cout<<'$';
cout << setw(79)<<'$';
cout << '$';
cout << setw(79)<<'$';
cout << '$'<<"      " <<"Welcome to the mortgage information calculator 2013"
<<"                     " << '$';
cout <<'$';
cout << setw(79)<<'$';
cout<<'$';
cout << setw(79)<<'$';
cout <<'$'<< "     "<< " Made exclusively for Dewey,Cheatum and Howe bankers"
<<"                     "<<'$';
cout <<'$';
cout << setw(79)<<'$';
cout<<'$'<<"      "<< "by: Steven Fisher"
<<"                                                       "<<'$';
cout <<'$';
cout << setw(79)<<'$';
cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl; 

system ("pause");




return 0; 

}

So here is my code. I'm new to the C++ language and I was assigned a project in class and I have to calculate the monthly payment for a house mortgage.

I need to use the pow function and multiply the power by an expression. Here's what I tried:

(float)(MONTHLY_RATE*AMOUNT_MORG)*(pow(1.542,180))

and when I run the program I get an answer of 1.#inf.

Any help would be appreciated.

Answer 1

1.542¹⁸⁰ is more than 7,164,522,793,368,325,816,802,274,738,448,555. That's a pretty big number, are you sure it fits in your floating point type?

Based on your comments below, it looks like you want to be using 1.00542. You have several other copies of that information that are wrong too (MONTHLY_RATE, FORMULA_RATE).