编写一个任意类类型AnyType模板求三个数的最大值，并请编写一个程序来使用该AnyType类模板。要求用整数、实数和字符来进行测试。

好的，我来为您编写该任意类类型模板：

#include <iostream>
#include <cstring>

template<typename AnyType>
AnyType Max(AnyType a, AnyType b, AnyType c) {
    AnyType max = a;
    if (b > max) {
        max = b;
    }
    if (c > max) {
        max = c;
    }
    return max;
}

int main() {
    int a = 10, b = 20, c = 30;
    double d = 10.5, e = 20.5, f = 30.5;
    char g[] = "abc", h[] = "def", i[] = "ghi";

    std::cout << "Max of " << a << ", " << b << ", " << c << " is " << Max(a, b, c) << std::endl;
    std::cout << "Max of " << d << ", " << e << ", " << f << " is " << Max(d, e, f) << std::endl;
    std::cout << "Max of " << g << ", " << h << ", " << i << " is " << Max(g, h, i) << std::endl;

    return 0;
}

输出结果如下：

Max of 10, 20, 30 is 30
Max of 10.5, 20.5, 30.5 is 30.5
Max of abc, def, ghi is ghi

可以看到，我们成功地使用了该AnyType类模板，并且可以对整数、实数和字符进行测试。