实验2

task1.c

#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("20256136%04d\n", random_no);
            }

            cnt++;
        }
        system("pause");
        return 0;
}

 

 

使学号最后两位数变化，

随机生成五组学号

 

task2.c

#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("%d", &choice);

        if(choice == 0)
            break;

        if(choice < 1 || chioce > 4){
            printf("无效的饮料编号，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("%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1：上一次的饮料的价格将会加到这一次上面。

问2：使程序返回到上面if的这一步，继续选择饮料编号或者数量。

 

task3.c

#include<stdio.h>
int main()
{
    char ans;
    printf("交通信号灯的颜色：");
    while(scanf(" %c", &ans) != EOF)
    {

    if(ans == 'r')
    {
        printf("stop!\n");
    }
    else if(ans == 'g')
    {
        printf("go go go\n");
    }
    else if(ans == 'y')
    {
        printf("wait a minute\n");
    }
    else
    {
        printf("soemthing must be wrong...\n");
    }
}   
    return 0;

}

 

 

 

task4.c

#include<stdio.h>
int main()
{
    double n, total = 0, max = 0, min = 20000;
    printf("输入今日开销，直到输入-1时终止：\n");  // 修正：\n 而不是 n
    
    while(1)
    {
        scanf("%lf", &n);
        
        if(n == -1)
            break;
        
        total += n;
        
        if(n > max)
        {
            max = n;
        }
        
        if(n < min)
        {
            min = n;
        }
    }
    
    printf("今日累计消费：%.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;
}

 

 

task5.c

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

    return 0;
}

 

task6.c

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

int main() 
{
    srand((unsigned int)time(NULL));

    int luckyDay = rand() % 30 + 1;
    int guess, count = 0;

    printf("猜猜2025年11月哪一天是你的lucky day\n");
    while (count < 3) 
    {
        count++;
        printf("开始喽，你有三次机会，猜吧(1~30): ");
        scanf("%d", &guess);

        if (guess == luckyDay)
         {
            printf("哇，猜中了:)\n");
            break;
        } 
        else if (guess > luckyDay) 
        {
            printf("你猜的日期晚了，你的lucky day在前面哦\n");
        } 
        else 
        {
            printf("你猜的日期早了，你的lucky day还没到呢\n");
        }
        if (count < 3) {
            printf("再猜(1~30): ");
        }
    }