用c++做一个小小计算器，它能够实现以下功能 1 加法 2 减法 3 乘法 4 除法 5 取模运算 6 判断数字的位数 7 计算圆面积 8 判断闰年 9 成绩转换 10 计算从1到输入数之间的奇数和 11 计算从1到输入数之间的偶数和 12 输出从1到输入数之间所有3的倍数 13 求即被3整除又被5整除的数 14 求水仙花数 15 求最大值 16 求最大最小值 17 数组—冒泡排序 18 数组-矩阵转置 19 数组-求矩阵对角线和 20 统计单词输入个数 21 静态创建链表 22 动态创建链表 23 学生成绩排序 24 学生成绩普涨10分 25 退出

好的，以下是C++代码实现小型计算器，可以实现你所列出的所有功能：

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

// 计算器函数定义
void calculator() {
    int choice;
    int num1, num2;

    while (true) {
        cout << "\n请选择要进行的操作：" << endl;
        cout << "1.加法" << endl;
        cout << "2.减法" << endl;
        cout << "3.乘法" << endl;
        cout << "4.除法" << endl;
        cout << "5.取模运算" << endl;
        cout << "6.判断数字的位数" << endl;
        cout << "7.计算圆面积" << endl;
        cout << "8.判断闰年" << endl;
        cout << "9.成绩转换" << endl;
        cout << "10.计算从1到输入数之间的奇数和" << endl;
        cout << "11.计算从1到输入数之间的偶数和" << endl;
        cout << "12.输出从1到输入数之间所有3的倍数" << endl;
        cout << "13.求即被3整除又被5整除的数" << endl;
        cout << "14.求水仙花数" << endl;
        cout << "15.求最大值" << endl;
        cout << "16.求最大最小值" << endl;
        cout << "17.数组-冒泡排序" << endl;
        cout << "18.数组-矩阵转置" << endl;
        cout << "19.数组-求矩阵对角线和" << endl;
        cout << "20.统计单词输入个数" << endl;
        cout << "21.静态创建链表" << endl;
        cout << "22.动态创建链表" << endl;
        cout << "23.学生成绩排序" << endl;
        cout << "24.学生成绩普涨10分" << endl;
        cout << "25.退出" << endl;

        cin >> choice;

        switch (choice) {
        case 1:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            cout << "两数之和为：" << num1 + num2 << endl;
            break;
        case 2:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            cout << "两数之差为：" << num1 - num2 << endl;
            break;
        case 3:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            cout << "两数之积为：" << num1 * num2 << endl;
            break;
        case 4:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            if (num2 == 0) {
                cout << "除数不能为0，请重新输入！" << endl;
                break;
            }
            cout << "两数之商为：" << num1 / num2 << endl;
            break;
        case 5:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            if (num2 == 0) {
                cout << "除数不能为0，请重新输入！" << endl;
                break;
            }
            cout << "两数取模运算的结果为：" << num1 % num2 << endl;
            break;
        case 6:
            cout << "请输入一个整数：" << endl;
            cin >> num1;
            cout << "该整数的位数为：" << to_string(num1).length() << endl;
            break;
        case 7:
            cout << "请输入半径：" << endl;
            cin >> num1;
            cout << "圆的面积为：" << 3.14 * pow(num1, 2) << endl;
            break;
        case 8:
            cout << "请输入一个年份：" << endl;
            cin >> num1;
            if ((num1 % 4 == 0 && num1 % 100 != 0) || (num1 % 400 == 0)) {
                cout << num1 << "年是闰年！" << endl;
            }
            else {
                cout << num1 << "年不是闰年！" << endl;
            }
            break;
        case 9:
            cout << "请输入成绩：" << endl;
            cin >> num1;
            if (num1 >= 90 && num1 <= 100) {
                cout << "A" << endl;
            }
            else if (num1 >= 80 && num1 < 90) {
                cout << "B" << endl;
            }
            else if (num1 >= 70 && num1 < 80) {
                cout << "C" << endl;
            }
            else if (num1 >= 60 && num1 < 70) {
                cout << "D" << endl;
            }
            else if (num1 >= 0 && num1 < 60) {
                cout << "E" << endl;
            }
            else {
                cout << "输入成绩有误！" << endl;
            }
            break;
        case 10:
            cout << "请输入一个整数：" << endl;
            cin >> num1;
            cout << "从1到" << num1 << "之间的奇数和为：" << (num1 + 1) / 2 * (num1 % 2) + num1 / 2 * ((num1 + 1) % 2) << endl;
            break;
        case 11:
            cout << "请输入一个整数：" << endl;
            cin >> num1;
            cout << "从1到" << num1 << "之间的偶数和为：" << num1 / 2 * 2 * (num1 % 2) + (num1 + 1) / 2 * ((num1 + 1) % 2) << endl;
            break;
        case 12:
            cout << "请输入一个整数：" << endl;
            cin >> num1;
            cout << "从1到" << num1 << "之间所有3的倍数为：";
            for (int i = 3; i <= num1; i += 3) {
                cout << i << " ";
            }
            cout << endl;
            break;
        case 13:
            cout << "请输入一个整数：" << endl;
            cin >> num1;
            cout << "即被3整除又被5整除的数为：";
            for (int i = 15; i <= num1; i += 15) {
                cout << i << " ";
            }
            cout << endl;
            break;
        case 14:
            cout << "所有的水仙花数为：";
            for (int i = 100; i <= 999; i++) {
                int a = i / 100;
                int b = i / 10 % 10;
                int c = i % 10;
                if (pow(a, 3) + pow(b, 3) + pow(c, 3) == i) {
                    cout << i << " ";
                }
            }
            cout << endl;
            break;
        case 15:
            cout << "请输入两个数：" << endl;
            cin >> num1 >> num2;
            cout << "最大值为：" << max(num1, num2) << endl;
            break;
        case 16:
            cout << "请输入三个数：" << endl;
            cin >> num1 >> num2 >> num2;
            cout << "最大值为：" << max(max(num1, num2), num3) << endl;
            cout << "最小值为：" << min(min(num1, num2), num3) << endl;
            break;
        case 17:
            int arr[10];
            cout << "请输入10个数：" << endl;
            for (int i = 0; i < 10; i++) {
                cin >> arr[i];
            }
            for (int i = 0; i < 9; i++) {
                for (int j = 0; j < 9 - i; j++) {
                    if (arr[j] > arr[j + 1]) {
                        int temp = arr[j];
                        arr[j] = arr[j + 1];
                        arr[j + 1] = temp;
                    }
                }
            }
            cout << "排序后的数组为：";
            for (int i = 0; i < 10; i++) {
                cout << arr[i] << " ";
            }
            cout << endl;
            break;
        case 18:
            int matrix[2][3];
            cout << "请输入一个2*3的矩阵：" << endl;
            for (int i = 0; i < 2; i++) {
                for (int j = 0; j < 3; j++) {
                    cin >> matrix[i][j];
                }
            }
            cout << "矩阵转置后为：" << endl;
            for (int i = 0; i < 3; i++) {
                for (int j = 0; j < 2; j++) {
                    cout << matrix[j][i] << " ";
                }
                cout << endl;
            }
            break;
        case 19:
            int matrix1[3][3];
            cout << "请输入一个3*3的矩阵：" << endl;
            for (int i = 0; i < 3; i++) {
                for (int j = 0; j < 3; j++) {
                    cin >> matrix1[i][j];
                }
            }
            int sum = 0;
            for (int i = 0; i < 3; i++) {
                sum += matrix1[i][i];
            }
            cout << "矩阵对角线和为：" << sum << endl;
            break;
        case 20:
            string s;
            cout << "请输入一段英文文本：" << endl;
            getline(cin, s);
            int count = 0;
            for (int i = 0; i < s.length(); i++) {
                if (s[i] == ' ') {
                    count++;
                }
            }
            cout << "单词个数为：" << count + 1 << endl;
            break;
        case 21:
            struct Node {
                int data;
                Node* next;
            };
            Node* head = new Node;
            head->next = NULL;
            cout << "请输入链表长度：" << endl;
            cin >> num1;
            cout << "请输入链表元素：" << endl;
            for (int i = 0; i < num1; i++) {
                Node* p = new Node;
                cin >> p->data;
                p->next = head->next;
                head->next = p;
            }
            cout << "链表为：";
            Node* p = head->next;
            while (p) {
                cout << p->data << " ";
                p = p->next;
            }
            cout << endl;
            break;
        case 22:
            struct Node1 {
                int data;
                Node1* next;
            };
            Node1* head1 = new Node1;
            head1->next = NULL;
            Node1* p1 = head1;
            cout << "请输入链表元素，输入0结束输入：" << endl;
            while (true) {
                Node1* q = new Node1;
                cin >> q->data;
                if (q->data == 0) {
                    break;
                }
                q->next = NULL;
                p1->next = q;
                p1 = q;
            }
            cout << "链表为：";
            Node1* q1 = head1->next;
            while (q1) {
                cout << q1->data << " ";
                q1 = q1->next;
            }
            cout << endl;
            break;
        case 23:
            struct Student {
                string name;
                int score;
            };
            Student stu[3];
            cout << "请输入3个学生的姓名和成绩：" << endl;
            for (int i = 0; i < 3; i++) {
                cin >> stu[i].name >> stu[i].score;
            }
            for (int i = 0; i < 2; i++) {
                for (int j = 0; j < 2 - i; j++) {
                    if (stu[j].score < stu[j + 1].score) {
                        Student temp = stu[j];
                        stu[j] = stu[j + 1];
                        stu[j + 1] = temp;
                    }
                }
            }
            cout << "按照成绩从高到低排序后的学生信息为：" << endl;
            for (int i = 0; i < 3; i++) {
                cout << "姓名：" << stu[i].name << "，成绩：" << stu[i].score << endl;
            }
            break;
        case 24:
            int score[3];
            cout << "请输入3个学生的成绩：" << endl;
            for (int i = 0; i < 3; i++) {
                cin >> score[i];
                score[i] += 10;
            }
            cout << "加分后的学生成绩为：" << endl;
            for (int i = 0; i < 3; i++) {
                cout << score[i] << " ";
            }
            cout << endl;
            break;
        case 25:
            cout << "退出程序！" << endl;
            exit(0);
        default:
            cout << "输入有误，请重新输入！" << endl;
            break;
        }
    }
}

int main() {
    calculator();
    return 0;
}

运行程序后，根据菜单提示选择相应的功能即可。