C语言编写的统计学中几种特殊函数值计算的程序代码，包括伽马函数值、正态分布函数值、t分布函数值、贝塔函数值、误差函数值等等。-Code value of several special functions written in C, statistically, including the gamma function value, the value of the normal distribution function, t value of the distribution functio