实验二

实  验  1

#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;

    srand(time(NULL));

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

        if (random_major)
        {
            random_no = rand() % N1 + 1;
            printf("20256343%04d\n", random_no);
        }
        else
        {
            random_no = rand() % N2 + 1;
            printf("20256343%04d\n", random_no);
        }

        cnt++;
    }

    return 0;
}

 

 

问题1：获取当前时间

问题2：抽取5个倒霉蛋儿

实  验  2

#include<stdio.h>

int main()
{
    int choice, quality;
    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("%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("%d", &quality);

        if (quality < 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 * quality;
        else if (choice == 3)
            total_price += 5 * quality;
        else
            total_price += 2 * quality;

        printf("请投入金额：");
        scanf("%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;
}

 

问题1：总价被保留到下一个循环

问题2：立即执行下一个循环

实  验  3

#include<stdio.h>
int main()
{
    char light = 0;
    while (light != EOF)
    {
        light = getchar();
        if (light == 'r')
            printf("stop!\n");
        else if (light == 'g')
            printf("go go go\n");
        else if (light == 'y')
            printf("wait a minute\n");
        else
            printf("something must be wrong...\n");
        getchar();
        light = 0;
    }
    return 0;
}

实  验  4

#include<stdio.h>

int main()
{
    double $ = 0;
    double all = 0;
    double d = 0;
    double x = 99999;
    while (1)
    {
        scanf_s("%lf", &$);
        if ($ == -1)
            break;
        if ($ <= 0 || $ > 20000)
            continue;
        all += $;
        if ($ > d)
            d = $;
        if ($ < x)
            x = $;
    }
    printf("今日累计消费总额：%.1f\n", all);
    printf("今日最高一笔开销：%.1f\n", d);
    printf("今日最低一笔开销：%.1f\n", x);
    return 0;
}

实  验  5

#include<stdio.h>

int main()
{
    int a, b, c;
    while (scanf_s("%d%d%d", &a, &b, &c) != EOF)
    {
        if (a + b <= c || a + c <= b || b + c <= a)
        {
            printf("不能构成三角形\n");
            continue;
        }
        if (a == b && b == c)
            printf("等边三角形\n");
        else if (a == b || a == c || b == c)
            printf("等腰三角形\n");
        else if (a* a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a)
            printf("直角三角形\n");
        else
            printf("普通三角形\n");
    }
    return 0;
}

实  验  6

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
int main()
{
    srand(time(NULL));
    int ld = rand() % 30 + 1;
    int ans;
    int n = 3;
    int i;
    printf("猜猜2025年11月哪一天是你的lucky day\n\n");
    printf("开始喽，你有三次机会，猜吧(1~30):");
        for (i = 0; i < n; i++)
        {
            scanf_s("%d", &ans);
            printf("\n");
            if (ans == ld)
            {
                break;
            }
            else if (ans > ld)
            {
                printf("你猜的日期晚了，你的lucky day在前面哦\n\n");
                while (i < n-1)
                {
                    printf("再猜(1~30):");
                    break;
                }
            }
            else
            {
                printf("你猜的日期早了，你的lucky day还没到呢\n\n");
                while (i < n-1)
                {
                    printf("再猜(1~30):");
                    break;
                }
            }
        }
        if (ans == ld)
        {
            printf("lucky day");
        }
        else
        {
            printf("次数用光了。偷偷告诉你，11月你的lucky day是%d号", ld);
        }
    return 0;
}