实验2
任务1：
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 #define N 5 6 #define N1 397 7 #define N2 476 8 #define N3 21 9 10 int main() { 11 int cnt; 12 int random_major, random_no; 13 14 srand(time(NULL)); 15 16 cnt = 0; 17 while(cnt < N) { 18 random_major = rand() % 2; 19 20 if(random_major) { 21 random_no = rand() % (N2 - N1 + 1) + N1; 22 printf("20248329%04d\n", random_no); 23 } 24 else { 25 random_no = rand() % N3 + 1; 26 printf("20248395%04d\n", random_no); 27 } 28 29 cnt++; 30 } 31 32 return 0; 33 }
Q1：从11和12班中抽学号
Q2：从奇安信班中抽人
Q3：一共抽5人
任务2：
1 #include <stdio.h> 2 #include <math.h> 3 4 int main() { 5 double a, b, c; 6 double delta, p1, p2; 7 8 while(scanf("%lf%lf%lf", &a, &b, &c) != EOF) { 9 if(a == 0) { 10 printf("a = 0, invalid input\n"); 11 continue; 12 } 13 14 delta = b*b - 4*a*c; 15 p1 = -b/2/a; 16 p2 = sqrt(fabs(delta))/2/a; 17 18 if(delta == 0) 19 printf("x1 = x2 = %.2g\n", p1); 20 else if(delta > 0) 21 printf("x1 = %.2g, x2 = %.2g\n", p1+p2, p1-p2); 22 else { 23 printf("x1 = %.2g + %.2gi, ", p1, p2); 24 printf("x2 = %.2g - %.2gi\n", p1, p2); 25 } 26 } 27 28 return 0; 29 }
任务3：
1 #include<stdio.h> 2 #include<stdlib.h> 3 4 int main(){ 5 char c; while(scanf("%c",&c)!=EOF){ 6 7 getchar(); 8 if(c=='r'){ 9 printf("stop!\n"); 10 continue; 11 } 12 if(c=='y'){ 13 printf("wait a minute\n"); 14 continue; 15 } 16 if(c=='g'){ 17 printf("go go go\n"); 18 continue; 19 } 20 else{ 21 printf("something must be wrong\n"); 22 } 23 } 24 system("pause"); 25 return 0; 26 }
任务4：
1 #include <stdio.h> 2 #include <stdlib.h> 3 int main() { 4 double expense; 5 double max = 0.0; 6 double min = 20000.0; 7 double total = 0.0; 8 printf("输入今日开销，直到输入-1终止: \n"); 9 while (expense!= -1) { 10 scanf("%lf",&expense); 11 if (expense > max) { 12 max = expense; 13 } 14 if (expense < min&&expense>0) { 15 min = expense; 16 } 17 total += expense; 18 } 19 20 printf("今日最高一笔开销: %.1lf\n", max); 21 printf("今日最低一笔开销: %.1lf\n", min); 22 printf("今日累计消费总额: %.1lf\n", total); 23 system("pause"); 24 return 0; 25 }
任务5：
1 #include <stdio.h> 2 #include <stdlib.h> 3 int main() { 4 int a,b,c; 5 6 while (scanf("%d%d%d",&a,&b,&c)!=EOF) { 7 8 if (a+b<=c||a+c<=b||b+c<=a) { 9 printf("不能构成三角形\n"); 10 } 11 else if (a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a) { 12 printf("直角三角形\n"); 13 } 14 else if(a==b==c){ 15 printf("等边三角形\n"); 16 } 17 else if(a==b||a==c||b==c){ 18 printf("等腰三角形\n"); 19 } 20 else{ 21 printf("普通三角形\n"); 22 } 23 } 24 25 return 0; 26 }
任务6：
1 #include <stdio.h> 2 #include<time.h> 3 4 int main() { 5 srand(time(NULL)); 6 int random=rand()%30+1; 7 int num; 8 9 10 printf("猜猜2024年11月哪一天会是你的lucky day\n"); 11 printf("开始咯，你有三次机会，猜吧（1~30）；"); 12 13 int cnt=0; 14 while(cnt<3){ 15 scanf ("%d",&num); 16 17 if(num==random){ 18 printf("哇，猜中了：）"); 19 break; 20 } 21 22 else if(num>random){ 23 printf("你猜的日期晚了，你的luckyday在前面哦\n"); 24 25 26 } 27 28 else{ 29 printf("你猜的日期早了，你的luckyday还没到呢\n"); 30 31 32 } 33 if(cnt<2){ 34 35 printf("再猜："); 36 } 37 38 cnt++; 39 40 } 41 if(cnt==3){ 42 43 printf("机会用光啦。偷偷告诉你，你的luckyday是%d号\n",random); 44 } 45 return 0; 46 }
