Rounding

[Kamui]

How can you get decimal places to be rounded up? Like for instance if you had 3.125 and you wanted it to be output as 3.13.

[Philwx]

public double roundMe(int positionRoundingTo, double original)


// I could do this for you but I would feel guilty if it was your homework.

// Therefore I'll do it by example:

// you seem to be wanting to go to two decimal places

roundMe(2, 3.125);

double multiplier = 10.0 ^ (positionRoundingTo)

ie 100.0 = 10 ^ 2;

(since you want two decimal points)

3.125 * multiplier = 312.5

(3.125 * 100.0 = 312.5)


The trick with rounding is to add (0.5) once you have the decimal in the right spot.

312.5 + 0.5 = 313.0

then you keep just the integer portion of 313.0, resulting in 313.


you then make 313 back into a double.

313.0

then you divide it by that multiplier number determined above.
313.0/100.0 = 3.13

and return it as your answer:
3.13