在本程序段中，利用迭代法可以求出某个实数的平方根，利用递归的方法可以求出某个整数的阶乘。需要注意的是在进行除法运算的时候需要考虑分母是否为零。在主函数中，调用相应的函数即可实现运算，最后输出结果。-In this program segment, the iteration can be calculated using a square root of real numbers, using a recursive way to find the factorial of an integer. Note that during the time division operation need to consider whether the denominator is zero. In the main function, call the appropriate function can be realized operation, the final output.