if statement with long equation issue

[mwmnj]

 if (monthlyPayment <(loanAmount * monthlyRate *(pow ((1 + monthlyRate) , desiredYears))) / ((pow ((1 + monthlyRate) , desiredYears))  - 1)) 
        {    
             cout << "You won't pay your loan off within " << desiredYears << " years if you choose that payment."<< endl; 
             cout << "The minimum monthly payment needed to pay off loan in " << desiredYears << " years is $"; 
             cout <<(loanAmount * monthlyRate *(pow ((1 + monthlyRate) , desiredYears))) << endl;              
        }       
             

Even if the monthlyPayment input is higher than the number computed in this formula, this if statement executes. Anyone have any clue why? thanks!

[hamsterman]

Are you sure it is higher?
replace line 1 with

double tmp =  loanAmount * monthlyRate *pow (1 + monthlyRate , desiredYears) / (pow (1 + monthlyRate , desiredYears)  - 1);//you don't need all those parentheses
cout << "input was " << monthlyPayment << " and tmp is " << tmp << '\n';
if(monthlyPayment < tmp) ...

[mwmnj]

hmm, With your code it is not higher. I guess the formula just doesn't make sense then since it is supposed to calculate the minimum payment to make in order to have the loan repaid before a certain period of time. with my last input, the loan would be paid off in 3 years but tmp( desired payment to make in order to have loan paid off in a certain period of time) was higher than my input and thus said the loan would not be paid off within the desired amount of time. (which was higher than 3 years.)