实验2
试验任务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)); // 以当前系统时间作为随机种子 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 system("pause"); 25 return 0; 26 27 }
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问题1
使运行结果随时间有不同变化,不是一个结果
问题2
根据系统时间挑选相应的学号
试验任务2
1 #include <stdio.h> 2 #include<stdlib.h> 3 int main() { 4 int choice, quantity; 5 float total_price = 0, amount_paid, change; 6 while (1) { 7 printf("\n自动饮料售卖机菜单:\n"); 8 printf("1. 可乐 - 3 元/瓶\n"); 9 printf("2. 雪碧 - 3 元/瓶\n"); 10 printf("3. 橙汁 - 5 元/瓶\n"); 11 printf("4. 矿泉水 - 2 元/瓶\n"); 12 printf("0. 退出购买流程\n"); 13 printf("请输入饮料编号: "); 14 scanf("%d", &choice); 15 if (choice == 0) 16 break; 17 if (choice < 1 || choice > 4) { 18 printf("无效的饮料编号,请重新输入。\n"); 19 continue; 20 } 21 printf("请输入购买的数量: "); 22 scanf("%d", &quantity); 23 if (quantity < 0) { 24 printf("购买数量不能为负数,请重新输入。\n"); 25 continue; 26 } 27 if(choice == 1 || choice == 2) 28 total_price += 3 * quantity; 29 else if(choice == 3) 30 total_price += 5 * quantity; 31 else 32 total_price += 2 * quantity; 33 printf("请投入金额: "); 34 scanf("%f", &amount_paid); 35 change = amount_paid - total_price; 36 printf("本次购买总价: %.2f 元\n", total_price); 37 printf("找零: %.2f 元\n", change); 38 total_price = 0; 39 } 40 printf("感谢您的购买,欢迎下次光临!\n"); 41 return 0; 42 system("pause"); 43 return 0; 44 }
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问题1
本次购买总价会累加
问题2
结束本次循环,进行下一次循环
试验任务3
1 #include <stdio.h> 2 #include<stdlib.h> 3 int main() { 4 char m; 5 while (scanf("%c", &m) != EOF) { 6 if (m == 'r') { 7 printf("stop!\n"); 8 } else if (m == 'g') { 9 printf("go go go\n"); 10 } else if (m == 'y') { 11 printf("wait a minute\n"); 12 } else { 13 printf("something must be wrong...\n"); 14 } 15 getchar(); 16 } 17 system("pause"); 18 return 0; 19 }
试验任务4
1 #include<stdio.h> 2 #include<stdlib.h> 3 int main(){ 4 double asumption,sum=0.0,a=0.0,b=20000.0; 5 printf("输入今日开销,直到输入-1终止"); 6 while(1){ 7 scanf("%lf",&asumption); 8 if(asumption==-1){ 9 break; 10 } 11 sum+=asumption; 12 if(asumption>a){ 13 a=asumption; 14 } 15 if(asumption<b){ 16 b=asumption; 17 } 18 } 19 printf("今日累计消费总额:%.1f\n", sum); 20 printf("今日日最高一笔开销:%.1f\n", a); 21 printf("今日最低一笔开销:%.1f\n", b); 22 system("pause"); 23 return 0; 24 }
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试验任务5
1 #include <stdio.h> 2 #include<stdlib.h> 3 int main() 4 { 5 int a, b, c; 6 while (scanf("%d%d%d", &a, &b, &c)!=EOF) 7 { 8 if (a + b > c && a + c > b && b + c > a) 9 { 10 if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a) 11 { 12 printf("直角三角形\n"); 13 } 14 else if (a == b && a == c) 15 { 16 printf("等边三角形\n"); 17 } 18 else if (a == b || a == c || b == c) 19 { 20 printf("等腰三角形\n"); 21 } 22 else 23 { 24 printf("普通三角形\n"); 25 } 26 } 27 else 28 printf("不能构成三角形\n"); 29 } 30 system("pause"); 31 return 0; 32 }
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试验任务6
1 #include <stdio.h> 2 #include<stdlib.h> 3 #include<time.h> 4 int main() 5 { 6 int n,random,i=0; 7 srand(time(NULL)); 8 random = rand() % 30 + 1; 9 printf("猜猜2025年11月哪一天是你的lucky day\n"); 10 printf("开始喽,你有三次机会,猜吧(1~30):"); 11 while (i < 3) 12 { 13 14 scanf("%d", &n); 15 if (n < random) 16 { 17 printf("你猜的日期早了,你的lucky day还没到呢\n"); 18 19 } 20 if (n > random) 21 { 22 printf("你猜的日期晚了,你的lucky day在前面哦\n"); 23 24 } 25 if (n== random) 26 { 27 printf("哇,猜中了:)\n"); 28 break; 29 } 30 i++; 31 if (i <3) 32 { 33 printf("再猜(1~30):"); 34 } 35 36 37 } 38 if (n != random) 39 { 40 printf("次数用光啦。偷偷告诉你,11月你的lucky day是%d\n",random); 41 } 42 return 0; 43 }
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