1.分别编写四个同名函数max1，实现函数重载，在main（）函数中测试函数的功能

2.使用函数模板实现求任意类型数的最大值，针对不同的参数个数，编写两个同名函数模板max1，其参数个数不同，实现函数重载，在main（）函数中测试函数功能

3.编写递归函数int fib（int n），在主程序中输入n的值，调用fib函数计算Fibonacci级数。公式为fib（n-1）+fib（n-2）,n>2 fib(1)=fib(2)=1。使用if语句判断函数的出口，在程序中用cout语句中输出提示信息-1. Were prepared by the same name as the function of four max1, to achieve function overloading, the main () function to test the function of the function 2. Use a function template to achieve the maximum number of seeking any type, for different number of parameters, both with the same name written function template max1, the number of different parameters to achieve function overloading, the main () function to test function function 3. write a recursive function int fib (int n), n in the main program input values, call the fib function to calculate the Fibonacci series. The formula for fib (n-1)+ fib (n-2), n>　2　fib (1) = fib (2) = 1. Use if statement to check the function of the export statement in the program output using cout reminder