Rounding integers to nearest multiple of 10 [duplicate]

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I would just create a couple methods;

int RoundUp(int toRound)
{
     if (toRound % 10 == 0) return toRound;
     return (10 - toRound % 10) + toRound;
}

int RoundDown(int toRound)
{
    return toRound - toRound % 10;
}

Modulus gives us the remainder, in the case of rounding up 10 - r takes you to the nearest tenth, to round down you just subtract r. Pretty straight forward.

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