实验2

实验任务1

源代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

#define N 5
#define N1 80
#define N2 35

int main (){
    int  cnt;
    int random_major,random_no;



    cnt = 0;
    while(cnt<N){
        random_major =rand() % 2;

    

            if (random_major){
                random_major =rand() % 2;
                printf("20236343%04d\n",random_no);
            }
            else {
                random_no = rand() % N2 +1;
                printf("20256136%04d\n",random_no);
            }
            cnt++;
        }
        return 0;
    }

运行结果

 

 

 

 回答

有代码可以随机生成，而无代码只会生成一种

程序会随机的打出代码

 实验2

源代码

#include <stdio.h>

int main() {
    int choice, quantity;
    float total_price = 0, amount_paid, change;

    while (1) {
        printf("\n自动饮料售卖机菜单:\n");

        printf("1. 可乐 - 3 元/瓶\n");
        printf("2. 雪碧 - 3 元/瓶\n");
        printf("3. 橙汁 - 5 元/瓶\n");
        printf("4. 矿泉水 - 2 元/瓶\n");
        printf("0. 退出购买流程\n");
        printf("请输入饮料编号: ");
        scanf_s("%d", &choice);

        if (choice == 0)
            break;

        if (choice < 1 || choice > 4) {
            printf("无效的饮料编号，请重新输入。\n");
            continue;
        }

        printf("请输入购买的数量: ");
        scanf_s("%d", &quantity);

        if (quantity < 0) {
            printf("购买数量不能为负数，请重新输入。\n");
            continue;
        }

        if (choice == 1 || choice == 2)
            total_price += 3 * quantity;
        else if (choice == 3)
            total_price += 5 * quantity;
        else
            total_price += 2 * quantity;

        printf("请投入金额: ");
        scanf_s("%f", &amount_paid);

        change = amount_paid - total_price;
        printf("本次购买总价: %.2f 元\n", total_price);
        printf("找零: %.2f 元\n", change);

        total_price = 0;
    }

    printf("感谢您的购买，欢迎下次光临！\n");
    return 0;
}

运行结果

answer1：第一次的运行结果没变，但是后几次的支付金额会加上前几次

answer2再出现错误时可以保证重新循环；

实验3

源代码

#include<stdio.h>
#define _CRT_SECURE_NO_WARNINGS
int main() {
    char ch;
    while (1) {
        
        scanf_s("%c", &ch,1);
        if (ch == 'r') {
            printf("stop\n");
        }
        else if (ch == 'g') {
            printf("go go go\n");
        }
        else if (ch == 'y') {
            printf("wait a minute\n");
        }
        else { 
            printf("something must be wrong ...\n");
        }
        getchar();
    }
        return 0;
    
}

运行结果

实验5

源代码

#include <stdio.h>

int main() {
    float a, total = 0.0, max = 0.0, min = 20000.0;
    printf("输入今日开销，直到输入-1终止：\n");
    while (1) {
        scanf_s("%f", &a);
        if (a == -1) {
            break;
        }
        total += a;
        if (a > max) {
            max = a;
        }
        if (a < min) {
            min =a;
        }
    }
    printf("今日累计消费总额：%.1f\n", total);
    printf("今日最高一笔开销：%.1f\n", max);
    printf("今日最低一笔开销：%.1f\n", min);
    return 0;
}

运行结果

实验6

源代码

#include<stdio.h>
int main() {
    int a, b, c;
    
    while (1) {
        scanf_s("%d %d %d", &a, &b, &c);
        if ((a + b )> c && (b + c )&& a && (a + c) > b) {
            if ((a == b || b == c || c == a) && ((a * a + b * b) == (c * c) || (b * b + c * c) == a * a || (a * a + c * c == b * b))) {
                printf("等腰直角三角形\n");
                continue;
            }
            else if (a == b && a == c) {
                printf("等边三角形\n");
                continue;
            }
            else if (((a * a + b * b) == (c * c)) || ((b * b + c * c) == a * a) || (a * a + c * c == b * b)) {
                printf("直角三角形\n");
                continue;
            }
            else if (a == b || b == c || c == a) {
                printf("等腰三角形\n");
                continue;
            }
            else { printf("普通三角形\n"); }
        }
        else {
            printf("不能构成三角形\n"); }
        }

}

运行结果

实验6

源代码

#include<stdio.h>
#include<stdlib.h>
int main() {
    int num, min=1, max=30, t;
    num = min + rand() % (max - min + 1);
    printf("猜猜2025年11月哪一天是你的luckly day\n");
    printf("开始喽，你有三次机会猜吧（1~30）\n");


    
        
        for (int i = 1; i <= 3; i++) {
            scanf_s("%d", &t);
            if (t == num) {
                printf("哇，你猜对了");
                break;
            }
            else {
                if (t < num) {
                    printf("你猜的日期早了，你的lucky day在后面哦\n再猜（1~30）");

                }
                else
                {
                    printf("你猜的日期晚了，你的lucky day在前面哦\n再猜（1~30）");

                }

            }
            if (i == 3) {
                printf("次数用光了。偷偷告诉你，11月你的lucky day是%d", num);
            }
        }
        return 0;
        

}

运行结果