实验1
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 #define N 5 5 #define N1 80 6 #define N2 35 7 int main() { 8 int cnt; 9 int random_major, random_no; 10 srand(time(NULL)); 11 cnt = 0; 12 while(cnt < N) { 13 random_major = rand() % 2; 14 if(random_major) { 15 random_no = rand() % N1 + 1; 16 printf("20256343%04d\n", random_no); 17 } 18 else { 19 random_no = rand() % N2 + 1; 20 printf("20256136%04d\n", random_no); 21 } 22 cnt++; 23 } 24 return 0; 25 }
作用：将时间作为随机数种子，每次生成不同随机数
去掉后只能生成一组随机数
功能：随机生成学号
实验2
1 #include <stdio.h> 2 int main() { 3 int choice, quantity; 4 float total_price = 0, amount_paid, change; 5 while (1) { 6 printf("\n自动饮料售卖机菜单:\n"); 7 printf("1. 可乐 - 3 元/瓶\n"); 8 printf("2. 雪碧 - 3 元/瓶\n"); 9 printf("3. 橙汁 - 5 元/瓶\n"); 10 printf("4. 矿泉水 - 2 元/瓶\n"); 11 printf("0. 退出购买流程\n"); 12 printf("请输入饮料编号: "); 13 scanf("%d", &choice); 14 if (choice == 0) 15 break; 16 if (choice < 1 || choice > 4) { 17 printf("无效的饮料编号，请重新输入。\n"); 18 continue; 19 } 20 printf("请输入购买的数量: "); 21 scanf("%d", &quantity); 22 if (quantity < 0) { 23 printf("购买数量不能为负数，请重新输入。\n"); 24 continue; 25 } 26 if(choice == 1 || choice == 2) 27 total_price += 3 * quantity; 28 else if(choice == 3) 29 total_price += 5 * quantity; 30 else 31 total_price += 2 * quantity; 32 printf("请投入金额: "); 33 scanf("%f", &amount_paid); 34 change = amount_paid - total_price; 35 printf("本次购买总价: %.2f 元\n", total_price); 36 printf("找零: %.2f 元\n", change); 37 total_price = 0; 38 } 39 printf("感谢您的购买，欢迎下次光临！\n"); 40 return 0; 41 }
去掉后每次运行的总金额会进行叠加
不进行剩下的 直接进行下一次循环
实验3
1 #include <stdio.h> 2 int main() { 3 char x; 4 printf("请输入交通信号灯颜色："); 5 while(1){ 6 scanf(" %c", &x); 7 if(x == 'q' || x == 'Q'){ 8 break; 9 } 10 if(x == 'r' || x == 'R'){ 11 printf("stop!\n"); 12 } 13 else if(x == 'g' || x == 'G'){ 14 printf("go go go\n"); 15 } 16 else if(x == 'y' || x == 'Y'){ 17 printf("wait a minute\n"); 18 } 19 else{ 20 printf("something must be wrong...\n"); 21 22 } 23 printf("请输入交通信号灯颜色："); 24 } 25 26 return 0; 27 }
实验4
1 #include <stdio.h> 2 int main() { 3 float money; 4 float total = 0; 5 float max = 0; 6 float min = 0; 7 int first = 1; 8 9 printf("输入今日开销，直到输入-1终止：\n"); 10 11 while (1) { 12 scanf("%f", &money); 13 14 if (money == -1) { 15 break; 16 } 17 18 if (first == 1) { 19 min = money; 20 first = 0; 21 } 22 23 total = total + money; 24 25 if (money > max) { 26 max = money; 27 } 28 29 if (money < min) { 30 min = money; 31 } 32 } 33 34 printf("今日累计消费总额：%.1f\n", total); 35 printf("今日最高一笔开销：%.1f\n", max); 36 printf("今日最低一笔开销：%.1f\n", min); 37 38 return 0; 39 }
实验5
1 #include <stdio.h> 2 int main() { 3 int a, b, c; 4 5 while (1) { 6 scanf("%d%d%d", &a, &b, &c); 7 8 if (a + b > c && a + c > b && b + c > a) { 9 if (a == b && b == c) { 10 printf("等边三角形\n"); 11 } else if (a == b || a == c || b == c) { 12 printf("等腰三角形\n"); 13 } else if (a * a + b * b == c * c || 14 a * a + c * c == b * b || 15 b * b + c * c == a * a) { 16 printf("直角三角形\n"); 17 } else { 18 printf("普通三角形\n"); 19 } 20 } else { 21 printf("不能构成三角形\n"); 22 } 23 } 24 25 return 0; 26 }
实验6
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 int main() { 5 int lucky_day, guess, count; 6 7 srand(time(NULL)); 8 lucky_day = rand() % 30 + 1; 9 10 printf("猜猜2025年11月哪一天是你的lucky day\n"); 11 printf("开始喽，你有三次机会，猜吧(1~30)："); 12 13 count = 1; 14 while (count <= 3) { 15 scanf("%d", &guess); 16 17 if (guess == lucky_day) { 18 printf("哇，猜中了:）\n"); 19 break; 20 } else if (guess < lucky_day) { 21 printf("你猜的日期早了，你的lucky day还没到呢\n"); 22 } else { 23 printf("你猜的日期晚了，你的lucky day在前面哦\n"); 24 } 25 26 count = count + 1; 27 28 if (count <= 3) { 29 printf("再猜(1~30)："); 30 } 31 } 32 33 if (count > 3) { 34 printf("次数用光啦。偷偷告诉你，11月份的lucky day是%d号\n", lucky_day); 35 } 36 37 return 0; 38 }
