实验2作业
实验一：
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 #define N 5 6 #define N1 397 7 #define N2 376 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 25 else{ 26 random_no = rand() % N3 + 1; 27 } 28 29 cnt++; 30 } 31 32 return 0; 33 }
结果：
实验二：
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("%1f%1f%1f", &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 }
结果：
实验三：
1 #include <stdio.h> 2 3 int main(){ 4 char zimu; 5 6 while(scanf("%c",&zimu)!=EOF){ 7 if(zimu=='r'){ 8 getchar(); 9 printf("stop!\n"); 10 } 11 else if(zimu=='g'){ 12 getchar(); 13 printf("go go go\n"); 14 } 15 else if(zimu=='y'){ 16 getchar(); 17 printf("wait a minute\n"); 18 } 19 else{ 20 getchar(); 21 printf("something must be wrong\n"); 22 } 23 24 } 25 26 return 0; 27 28 }
结果：
实验四：
1 #include <stdio.h> 2 3 int main() { 4 float expense,min,max,total; 5 total = 0, max = 0, min = 20000; 6 7 printf("输入今日开销，直到输入-1终止：\n"); 8 while (1) { 9 scanf("%f", &expense); 10 11 if (expense == -1) 12 break; 13 14 if (expense > max) 15 max = expense; 16 if (expense < min) 17 min = expense; 18 19 total += expense; 20 21 } 22 printf("今日累计消费总额：%.1f\n", total); 23 printf("今日最高一笔开销：%.1f\n", max); 24 printf("今日最低一笔开销：%.1f\n", min); 25 26 return 0; 27 }
结果：
实验五：
1 #include <stdio.h> 2 3 int main() { 4 int a, b, c; 5 while (scanf("%d%d%d", &a, &b, &c) != EOF) { 6 if (a + b <= c || a + c <= b || b + c <= a) 7 printf("不能构成三角形\n"); 8 else { 9 if (a == b && a == c && b == c) 10 printf("等边三角形\n"); 11 else if (a == b || a == c || b == c) 12 printf("等腰三角形\n"); 13 else if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a) 14 printf("直角三角形\n"); 15 else 16 printf("普通三角形\n"); 17 18 } 19 } 20 21 return 0; 22 }
结果：
实验六:
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <time.h> 4 5 int main() { 6 int luckyday, guess, i=1; 7 srand(time(NULL)); 8 9 luckyday = rand() % 30 + 1; 10 11 printf("猜猜2024年11月哪一天会是你的lucky day\n\n"); 12 printf("开始咯，你有三次机会，猜吧（1~30）："); 13 14 while(i<=3) { 15 scanf("%d", &guess); 16 printf("\n"); 17 18 if (guess == luckyday) { 19 printf("哇，猜中了：）"); 20 break; 21 } 22 23 else if (guess < luckyday) 24 printf("你猜的日期早了，你的luckyday还没到呢\n\n"); 25 else 26 printf("你的日期晚了，你的luckyday在前面哦\n\n"); 27 28 i++; 29 30 if(i<=3) 31 printf("再猜（1~30):"); 32 33 } 34 35 if(i=4) 36 printf("次数用光啦。偷偷告诉你，11月你的luckyday是%d号", luckyday); 37 38 39 return 0; 40 }
结果：
