任务一
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 5 #define N1 397 #define N2 476 #define N3 21int 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() % (N2 - N1 + 1) + N1;printf("20248329%04d\n", random_no);}else {random_no = rand() % N3 + 1;printf("20248395%04d\n", random_no);}cnt++;}return 0; }
第二十一行的作用是生成397到476之间的随机数作为学号后缀
第二十五行的作用是生成1到21之间的随机数作为学号后缀
本程序功能为首先根据系统时间生成随机数种子，再生成随机数，若为奇数，则为20248329前缀的学号随机生成397到476之间的后缀，接着补0输出，若为偶数，则为20248395前缀的学号生成1到21之间的后缀，补0输出，上述流程共重复5次，共打印五行学号
任务二
#include <stdio.h> #include <math.h>int main() {double a, b, c;double delta, p1, p2; while(scanf("%lf%lf%lf", &a, &b, &c) != EOF) {if(a == 0) {printf("a = 0, invalid input\n");continue;}delta = b*b - 4*a*c;p1 = -b/2/a;p2 = sqrt(fabs(delta))/2/a;if(delta == 0)printf("x1 = x2 = %.2g\n", p1);else if(delta > 0)printf("x1 = %.2g, x2 = %.2g\n", p1+p2, p1-p2);else {printf("x1 = %.2g + %.2gi, ", p1, p2);printf("x2 = %.2g - %.2gi\n", p1, p2);}}return 0; }
任务三
#include<stdio.h> int main(){char a;while(scanf("%s",&a)!=EOF){if(a=='y'){printf("wait a minute\n");}else if(a=='r'){printf("stop!\n");}else if(a=='g'){printf("go go go\n");}else{printf("something must be wrong...\n");}}return 0; }
任务四
#include <stdio.h> int main(){printf("输入今日开销，直到输入-1终止\n");double money,sum=0,maxn=0,minn=1e10;while(scanf("%lf",&money) && (money!=-1)){if(money>maxn){maxn=money;}if(money<minn){minn=money;}sum+=money;}printf("今日累计消费总额：%.1f\n",sum);printf("今日最高一笔开销：%.1f\n",maxn);printf("今日最低一笔开销:%.1f\n",minn);return 0; }
任务五
#include <stdio.h>int main() {int a, b, c;while (scanf("%d %d %d", &a, &b, &c) == 3) {if (a + b <= c || a + c <= b || b + c <= a) {printf("不能构成三角形\n");} else {if (a == b && b == c) {printf("等边三角形\n");} else if (a == b || a == c || b == c) {printf("等腰三角形\n");} else {int max_side = a;if (b > max_side) max_side = b;if (c > max_side) max_side = c;if (max_side == a) {if (b * b + c * c == a * a) {printf("直角三角形\n");} else {printf("普通三角形\n");}} else if (max_side == b) {if (a * a + c * c == b * b) {printf("直角三角形\n");} else {printf("普通三角形\n");}} else {if (a * a + b * b == c * c) {printf("直角三角形\n");} else {printf("普通三角形\n");}}}}}return 0; }
任务六
#include <stdio.h> #include <stdlib.h> #include <time.h>int main() {int lucky_day, guess;int attempts = 3;srand(time(NULL));lucky_day = rand() % 30 + 1;printf("欢迎来到猜日期游戏！请猜测11月的幸运日（1到30）:\n");while (attempts > 0) {printf("你还有 %d 次机会。请输入你的猜测: ", attempts);scanf("%d", &guess);if (guess < 1 || guess > 30) {printf("请输入一个有效的日期（1到30之间）！\n");continue;}if (guess == lucky_day) {printf("恭喜你，猜对了！\n");return 0; } else if (guess < lucky_day) {printf("你猜的日期太早了。\n");} else {printf("你猜的日期太晚了。\n");}attempts--;}printf("很遗憾，你没有猜中。11月的幸运日是 %d。\n", lucky_day);return 0; }
