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Asked: 2026-06-01T23:44:37+00:00

I’d like to multiply two unsigned integers but I want the result to be

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I’d like to multiply two unsigned integers but I want the result to be in an unsigned long long variable

unsigned long long M;
unsigned int X;
unsigned int Y;

X = 999999;
Y = 9990;
M = X * Y;

M should be 9989990010 but for some reason it keeps being 1400055418

I’ve been troubled with this for a week now, and I think I reached the point where I want to cry!

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1 Answer

  1. Editorial Team

    You need to cast the X and Y to long long.

    M = (unsigned long long)X * Y;

    Enough to cast one of them the result will be based on the larger type.

    Otherwise the result will be int, hence the overflow. It will be casted to long long on assignment, but that would be too late:-)

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