Why Am I Getting An Error On This In Java? - Topic

GetSpanked

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Oct 13 2013 10:00am

double M = P *([I(1+I)^N])/[((1+I)^N)-1]);

says there is an error on the outside parenthesis and the division sign.

mebeatyou

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Oct 13 2013 10:25am

double M = P * ( [ I ( 1 + I ) ^ N ] ) / [ ( ( 1 + I ) ^ N ) - 1 ] );

The one at the very end before the semicolon doesn't have a matching parenthesis. Add another one at the beginning of the expression to encapsulate the whole thing. P * ( ( [ instead of P * ( [

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Oct 13 2013 11:17am

Quote (mebeatyou @ Oct 13 2013 11:25am)

double M = P*(([I(1+I)^N])/[((1+I)^N)-1]);

I have that and am still getting an error under these:

double M = P*(([I(1+I)^N])/[((1+I)^N)-1]);

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Oct 13 2013 11:21am

Then I changed it to this

double M = P*(([I(1+I)^N])/((((1+I)^N)-1)));

and get an error only under:

double M = P*(([I(1+I)^N])/((((1+I)^N)-1)));

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Oct 13 2013 11:22am

It says syntax error expression expected after this token

talking about that red parenthesis

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Oct 13 2013 11:52am

Quote (sarge799 @ Oct 13 2013 12:45pm)

Again, always use * to multiply.
Also you have several unneeded parenthesis.

Code

public static double calcMonthlyPayment( ) { // start calcMonthlyPayment

double P = getLoanAmount();
int N = getLoanLength();
double I = getInterestRate();
double M = P*((I*(1+I)^N)/(((1+I)^N-1)));

return M;
} // end calcMonthlyPayment

so now I have that, and now it says:

The operator ^ is undefined for the argument type(s) double, int

sarge799

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Oct 13 2013 12:00pm

Quote (GetSpanked @ Oct 13 2013 12:52pm)

Code

so now I have that, and now it says:

The operator ^ is undefined for the argument type(s) double, int

Exponents need to use the Math.pow function.
For example, (1+I)^N should be replaced by pow((1+I),N)

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Oct 13 2013 12:21pm

Quote (sarge799 @ Oct 13 2013 01:00pm)

Exponents need to use the Math.pow function.
For example, (1+I)^N should be replaced by pow((1+I),N)

Code

public static double calcMonthlyPayment( ) { // start calcMonthlyPayment

double P = getLoanAmount();
int N = getLoanLength();
double I = getInterestRate();
double top1 = I*(1+I);
double top = Math.pow(top1,N);
double bottom1 = (1+I);
double bottom2 = Math.pow(bottom1,N);
double bottom = bottom2 - 1;
double M = P*(top/bottom);

return M;

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Oct 13 2013 12:23pm

did that wrong

fixed

Code

public static double calcMonthlyPayment() { // start calcMonthlyPayment

double P = getLoanAmount();
int N = getLoanLength();
double I = getInterestRate();
double top1 = (1+I);
double top2 = Math.pow(top1,N);
double top = I*top2;
double bottom1 = (1+I);
double bottom2 = Math.pow(bottom1,N);
double bottom = bottom2 - 1;
double M = P*(top/bottom);

return M;
} // end calcMonthlyPayment

rockonkenshin

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#10

Oct 13 2013 02:09pm

Goddamn give your variables meaningful names that aren't single capital letters.

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