#include <iostream> using namespace std; void f(double A, double B, double C) { if (A > B) { if (B > C) cout << A << ">" << B << ">" << C << endl; } if (B > C) { if (C > A) cout << B << ">" << C << ">" << A << endl; } if (C > A) { if (A > B) cout << C << ">" << A << ">" << B << endl; } } int main() { double A, B, C; cout << "输入A,B,C:" << endl; cin >> A >> B >> C; f(A, B, C); return 0; }增加一个取最大值MAX

可以在函数中添加一个变量max来存储当前最大值，每次比较更新这个变量即可。修改后的代码如下：

#include <iostream>
using namespace std;

void f(double A, double B, double C) {
    double max = A;
    if (B > max) {
        max = B;
    }
    if (C > max) {
        max = C;
    }
    if (max == A) {
        if (B > C) {
            cout << A << ">" << B << ">" << C << endl;
        }
        else {
            cout << A << ">" << C << ">" << B << endl;
        }
    }
    else if (max == B) {
        if (A > C) {
            cout << B << ">" << A << ">" << C << endl;
        }
        else {
            cout << B << ">" << C << ">" << A << endl;
        }
    }
    else {
        if (A > B) {
            cout << C << ">" << A << ">" << B << endl;
        }
        else {
            cout << C << ">" << B << ">" << A << endl;
        }
    }
}

int main() {
    double A, B, C;
    cout << "输入A,B,C:" << endl;
    cin >> A >> B >> C;
    f(A, B, C);
    return 0;
}

在这个修改后的代码中，我们添加了一个变量max来存储当前最大值。首先，我们将A赋值给max作为初始最大值。然后，分别比较B和C与max的大小，如果比max大，就更新max的值。最后，根据max的值和A、B、C的大小关系输出结果。