实验一
#include <stdio.h>#include <stdlib.h>#include <time.h>#define N 5int main() {int number;int i;srand(time(0)); // 以当前系统时间作为随机种子for(i = 0; i < N; ++i) {number = rand() % 100 + 1;printf("20490042%04d\n", number);}return 0;}
lin13生成一个1到100之间的随机数
lin14作用是十进制整数形式输出number且长度为4，长度不足4就在前面补0
这个程序是用来抽取学生编号的
实验二
#include <stdio.h>https://en.cppreference.com/w/cpp/numeric/random/srandint 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;}switch (choice) {case 1:case 2:total_price += 3 * quantity;break;case 3:total_price += 5 * quantity;break;case 4:total_price += 2 * quantity;break;}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");return 0;}
重置总价格为0
break直接结束循环结构，continue跳过continue下面的语句
不需要，程序里面有
if (choice < 1 || choice > 4)
实验三
#include<stdio.h> int main() {char p;while(scanf("%c",&p)!=EOF){getchar();switch(p){case 'g':printf("go go go\n");break;case 'y':printf("wait a minute\n");break;case 'r':printf("stop!\n");break;default:printf("something must be wrong\n");}}return 0;}
实验四
#include<stdio.h> double max(double x,double y) {return(x>=y)?x:y; } double min(double x,double y) {return(x<=y)?x:y; } int main() {double m,sum,l,s;l=0;s=20000;sum=0;while(1){scanf("%lf",&m);if (m==-1)break;else{l=max(l,m);s=min(s,m);sum=sum+m;}}printf("今日消费总额:%0.1lf \n",sum);printf("今日最高一笔开销:%0.1lf \n",l);printf("今日最低一笔开销:%0.1lf \n",s);return 0; }
实验五
#include<stdio.h> #include<stdlib.h> int main() {int luckyday,i,guess;printf("猜猜2025年4月哪一天是你的lucky day \n");printf("开始咯，你有三次机会，，猜吧（0-30）：");luckyday=rand()%30+1;i-0;while(i<3){scanf("%i",&guess);if(guess==luckyday){printf("哇，猜中了:-)");break;}else if(guess>luckyday)printf("你猜的日期晚了，你的lucky day在前面哦 \n");elseprintf("你猜的日期早了，你的lucky day 还没到呢 \n");printf("再猜：");i=i+1 ;}return 0; }
实验六
#include<stdio.h> int main() {int i,n,u,m,t;i=0;t=0;scanf("%i",&n);for(i;i<n;i+=2){u=i;for(m=0;m<t;m+=1){printf(" \t");}for(u;u<n;u+=1){printf(" O \t");}u=i;printf("\n");for(m=0;m<t;m+=1){printf(" \t");}for(u;u<n;u+=1){printf("<H>\t");}printf("\n");u=i;for(m=0;m<t;m+=1){printf(" \t");}for(u;u<n;u+=1){printf("I I\t");}printf("\n");t=t+1;}}
