#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));// 以當(dāng)前系統(tǒng)時(shí)間作為隨機(jī)種子
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;
}

#include <stdio.h>
#include<stdlib.h>
int main() {
int choice, quantity;
float total_price = 0, amount_paid, change;
while (1) {
printf("\n自動(dòng)飲料售賣機(jī)菜單:\n");

printf("1. 可樂(lè) - 3 元/瓶\n");
printf("2. 雪碧 - 3 元/瓶\n");
printf("3. 橙汁 - 5 元/瓶\n");
printf("4. 礦泉水 - 2 元/瓶\n");
printf("0. 退出購(gòu)買流程\n");
printf("請(qǐng)輸入飲料編號(hào): ");
scanf("%d", &choice);
if (choice == 0)
break;
if (choice < 1 || choice > 4)
{

printf("無(wú)效的飲料編號(hào)，請(qǐng)重新輸入。\n");
continue;
}
printf("請(qǐng)輸入購(gòu)買的數(shù)量: ");
scanf("%d", &quantity);
if (quantity < 0) {
printf("購(gòu)買數(shù)量不能為負(fù)數(shù)，請(qǐng)重新輸入。\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("請(qǐng)投入金額: ");
scanf("%f", &amount_paid);
change = amount_paid - total_price;
printf("本次購(gòu)買總價(jià): %.2f 元\n", total_price);
        printf("找零：%.2f 元\n",change);
total_price = 0;
}
  printf("感謝您的購(gòu)買，歡迎下次光臨！\n");
  system("pause");
return 0;
}

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

#include <stdio.h>
#include<stdlib.h>
int main()
{
    double a=1,sum=0,b=0,c=20001;

    printf("輸入今日開(kāi)銷，直到輸入-1終止：\n");
    while (a != -1)
    {
        scanf("%lf", &a);
        if (a > 0 && a <= 20000)
        {
            sum += a;
            if (a > b)
            {
                b = a;
            }
            if (a < c)
            {
                c = a;
            }
        }
        
    }
        printf("今日累計(jì)消費(fèi)總額：%.1f\n", sum);
        printf("今日最高一筆開(kāi)銷：%.1f\n", b);
        printf("今日最低一筆開(kāi)銷：%.1f\n", c);
    
        return 0;
} 

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int a, b, c;
    while (scanf("%d%d%d", &a, &b, &c)!=EOF)
    {
        
        if (a + b > c && a + c > b && b + c > a)
        {


            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 if (a == b && a == c)
            {
                printf("等邊三角形\n");
            }
            else if (a == b || a == c || b == c)
            {
                printf("等腰三角形\n");
            }
            else
            {
                printf("普通三角形\n");
            }
        }
        else
            printf("不能構(gòu)成三角形\n");
    }
        return 0;
} 

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int n,random,i=0;
    srand(time(NULL));
    random = rand() % 30 + 1;
    printf("猜猜2025年11月哪一天是你的lucky day\n");
    printf("開(kāi)始嘍，你有三次機(jī)會(huì)，猜吧（1~30）：");
    while (i < 3)
    {
        
        scanf("%d", &n);
        if (n < random)
        {
            printf("你猜的日期早了，你的lucky day還沒(méi)到呢\n");
            
        }
        if (n > random)
        {
            printf("你猜的日期晚了，你的lucky day在前面哦\n");
           
        }
        if (n== random)
        {
            printf("哇，猜中了:)\n");
            break;
        }
        i++;
        if (i <3)
        {
            printf("再猜（1~30）：");
        }
        
       
    }
    if (n != random)
    {
        printf("次數(shù)用光啦。偷偷告訴你，11月你的lucky day是%d\n",random);
    }
    return 0;
}