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实验任务2 - pp

news 2026/6/13 16:53:45

task-1

源代码

#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));// 以当前系统时间作为随机种子
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;
}

运行结果截图

删去代码后运行结果截图

问题1

产生新的随机数

问题2

随机抽取5个学号

task-2

源代码

#include <stdio.h>
#include<stdlib.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 || 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", &quantity);
if (quantity < 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 * 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");system("pause");
return 0;
}

运行结果截图

删去line47代码后运行结果截图

问题1

输出结果中“本次购买总价”会累加

问题2

结束本次循环，进入下一次循环

task-3

源代码

#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;
}

运行结果截图

task-4

源代码

#include <stdio.h>
#include<stdlib.h>
int main()
{double a=1,sum=0,b=0,c=20001;printf("输入今日开销，直到输入-1终止：\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("今日累计消费总额：%.1f\n", sum);printf("今日最高一笔开销：%.1f\n", b);printf("今日最低一笔开销：%.1f\n", c);return 0;
}

运行结果截图

task-5

源代码

#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("等边三角形\n");}else if (a == b || a == c || b == c){printf("等腰三角形\n");}else{printf("普通三角形\n");}}elseprintf("不能构成三角形\n");}return 0;
}

运行结果截图

task-6

源代码

#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("开始喽，你有三次机会，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还没到呢\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("次数用光啦。偷偷告诉你，11月你的lucky day是%d\n",random);}return 0;
}