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Editorial Team
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Asked: 2026-05-14T00:57:53+00:00

I cannot understand why this throws undefined reference to `floor’ : double curr_time =

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I cannot understand why this throws undefined reference to `floor’“:

double curr_time = (double)time(NULL);
return floor(curr_time);

Hasn’t it been casted to double, which is what floor receives?

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1 Answer

  1. Editorial Team

    You possibly have run in to the infamous -lm problem: Compile as:

    gcc yourfile.c -o out -lm

    This is C FAQ 14.3 item as well.

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