Created
July 25, 2016 14:32
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VALUE factorials_num_double_factorial(VALUE num) | |
{ | |
long value = NUM2INT(num), result = 1; | |
if(value % 2 == 0) { | |
return INT2NUM( | |
pow(2, value / 2) * NUM2INT( | |
factorials_num_factorial(INT2NUM(value / 2)) | |
) | |
); | |
} else { | |
return INT2NUM( | |
NUM2INT(factorials_num_factorial(num)) / ( | |
pow(2, (value - 1) / 2) * NUM2INT( | |
factorials_num_factorial(INT2NUM((value - 1) / 2)) | |
) | |
) | |
); | |
} | |
} |
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