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#include <math.h>
#include <stdio.h>
...
    x = +NAN;      printf("trunc(%f) = %f\n", x, trunc(x));
    x = -NAN;      printf("trunc(%f) = %f\n", x, trunc(x));
}

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trunc(3.140000) = 3.000000
trunc(-2.718000) = -2.000000
...
trunc(-inf) = -inf
trunc(nan) = nan
trunc(nan) = nan