double tgamma ( double x); float tgammaf ( float x); long double tgammal (long double x);
double tgamma ( double x); float tgamma ( float x); long double tgamma (long double x); double tgamma (T x); // additional overloads for integral types
<cmath>
) for the integral types: These overloads effectively cast x to a double
before calculations (defined for T being any integral type).
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tgamma (0.500000) = 1.772454 |