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; }
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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; }
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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; }
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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; }
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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; }
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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; }
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实验总结
1.习惯使用换行符
2.
要求支持多组输入,直到用户按下CTRL+Z,回车,终止程序时,用
while (scanf("%c", &a)!=EOF)
{
}
3.要关注数据范围
找一组数的最小值时,令表示其的变量初始值大于改组数的最大值
4.
已知循环次数最好用for
5.
生成随机数
# #include<time.h>
# 确定类型
# srand(time(NULL));
# 确定随机数范围random = rand() % 30 + 1;(指1~30)
# random = rand() % 30(指0~29)