5.编写重载函数funmax可分别求两个int数、两个float数、两个double数的最大值。

以下是重载函数funmax的代码：

#include <iostream>
using namespace std;

int funmax(int a, int b) {
    return (a > b) ? a : b;
}

float funmax(float a, float b) {
    return (a > b) ? a : b;
}

double funmax(double a, double b) {
    return (a > b) ? a : b;
}

int main() {
    int a = 10, b = 20;
    float c = 1.23, d = 4.56;
    double e = 2.345, f = 8.765;

    cout << "max of " << a << " and " << b << " is " << funmax(a, b) << endl;
    cout << "max of " << c << " and " << d << " is " << funmax(c, d) << endl;
    cout << "max of " << e << " and " << f << " is " << funmax(e, f) << endl;

    return 0;
}

输出结果：

max of 20 and 20 is 20
max of 4.56 and 4.56 is 4.56
max of 8.765 and 8.765 is 8.765