I get wrong result! pls help on C++

[rcarlos243]

 

Spoiler

 

#include <iomanip>
#include <iostream>
using namespace std;
#include <cmath>
int main()
{
    //input values
    int p; // principle borrowed, i.e. 270000
    double rate; // anual demimal rate i.e. 5.125%
                 // the monthly rate = rate/1200
                 
                 
    // define constants
    int T = 30;  // term in years
    int n = T*12; //number of payments
    cout << "What's the amount borrowed? $";
    cin >> p;
    cin.ignore(1000, 10);
    
    cout << "What's the annual interest rate? ";
    cin >> rate;
    cin.ignore(1000, 10);
    
    double r = rate / (100*12);
    
    // mortgage
    double payment = (( p*pow( 1+r, n ) *r ) /pow( 1+r, n ) -1);
    
    cout << fixed << setprecision(2);
    // out to console
         
    cout << "\nTo borrow $" << p
         << " at the rate of " << rate <<"%"
         << " for " << T << " years,"
         << "\n your mortgage payment will be $" << payment << " per month";
}

 

 

I put amount borrowed 270,000 and I put annual interest rate at 5.125%

 

Monthly payment should be $1470.11 but I got $1152.12

 

any ideas?

 

edit: formula to calculate

[madknight3]

Print out the value at each step of the calculation, or use a debugger, to see exactly where things go wrong.

[fizzlesticks]

You're missing some parenthesis in the formula.

[rcarlos243]

1 minute ago, fizzlesticks said:

You're missing some parenthesis in the formula.

can you elaborate more? I literally have no idea...

[spenser_l]

13 minutes ago, rcarlos243 said:

double payment = (( p*pow( 1+r, n ) *r ) /(pow( 1+r, n ) -1));

 

[werto165]

3 minutes ago, rcarlos243 said:

can you elaborate more? I literally have no idea...

 // mortgage
    double payment = (( p*pow( 1+r, n ) *r ) /pow( 1+r, n ) -1)  

 

that one?