利用指针方法编写程序：1.输入3个整数，按由大到小的顺序输出。2.输入3字符串，按由大到小的顺序输出。

1. 输入3个整数，按由大到小的顺序输出：

#include <iostream>
using namespace std;

void Sort(int *a, int *b, int *c) {
    int tmp;
    if (*a < *b) {
        tmp = *a;
        *a = *b;
        *b = tmp;
    }
    if (*a < *c) {
        tmp = *a;
        *a = *c;
        *c = tmp;
    }
    if (*b < *c) {
        tmp = *b;
        *b = *c;
        *c = tmp;
    }
}

int main() {
    int a, b, c;
    cout << "请输入3个整数：";
    cin >> a >> b >> c;

    Sort(&a, &b, &c);

    cout << "由大到小的顺序输出为：" << c << " " << b << " " << a << endl;

    return 0;
}

2. 输入3个字符串，按由大到小的顺序输出：

#include <iostream>
#include <string>
using namespace std;

void Sort(string *a, string *b, string *c) {
    string tmp;
    if (*a < *b) {
        tmp = *a;
        *a = *b;
        *b = tmp;
    }
    if (*a < *c) {
        tmp = *a;
        *a = *c;
        *c = tmp;
    }
    if (*b < *c) {
        tmp = *b;
        *b = *c;
        *c = tmp;
    }
}

int main() {
    string a, b, c;
    cout << "请输入3个字符串：";
    cin >> a >> b >> c;

    Sort(&a, &b, &c);

    cout << "由大到小的顺序输出为：" << c << " " << b << " " << a << endl;

    return 0;
}