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作业二

news 2025/10/17 9:25:08

实验一

#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++;
}
return 0;
}

1.srand起到随机作用，去掉后运行结果均相同

2.功能为在两个班随机抽取5个学号

实验二

#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_s("%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_s("%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;elsetotal_price += 2 * quantity;printf("请投入金额: ");scanf_s("%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;
}

1.去掉后影响下一次运行结果，使数据不断相加

2.continue使while循环重新运行

实验三

#include<stdio.h>
int main() {char x;while (1) {scanf_s("%c",&x);getchar();if(x=='r') {printf("stop!\n");}else if (x=='g') {printf("go go go\n");}else if (x == 'y') {printf("wait a minute\n");}else {printf("somthing must be wrong...\n");}}return 0;
}

实验四

#include<stdio.h>
int main() {float x=0,max,min,tt=0;printf("输入直至-1\n");scanf_s("%f", &x);min = x;max = x;while (x!=-1) {tt = x + tt;if (min >= x) {min = x;}else if(max<=x){max = x;}scanf_s("%f", &x);}printf("累计%.1f\n",tt);printf("最高%.1f\n",max);printf("最低%.1f\n",min);return 0;
}

实验五

#include<stdio.h>
int main() {int a, b, c;while (1) {scanf_s("%d%d%d", &a, &b, &c);if (a + b > c && b + c > a && a + c > b) {if (a * a == b * b + c * c || b * b == a * a + c * c || c * c == a * a + b * b) {printf("直角三角形\n");}else if (a == b&&b== c) {printf("等边三角形\n");}else if (a == b || b == c || c == a) {printf("等腰三角形\n");}else {printf("普通三角形\n");}}elseprintf("不是三角形\n");}return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 30
int main() {int a,b,c=0;srand(time(NULL));printf("猜猜11月哪一天是你的幸运日\n");b = rand() % N + 1;for (int i = 0; i < 3; i++) {scanf_s("%d",&a);getchar();if (a > b) {printf("大啦\n");}else if (a < b) {printf("小啦\n");}else if (a == b) {printf("猜对啦\n");c = 1;}}if (c==0) {printf("没机会啦\n");}return 0;
}