实验2

实验1

源代码

 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     
34 }

图片

问题

生成397到476的随机数

生成0到21的随机数

抽取随机学号

实验2

源代码

 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        if(delta == 0)
18             printf("x1 = x2 = %.2g\n", p1);
19        else if(delta > 0)
20             printf("x1 = %.2g, x2 = %.2g\n", p1+p2, p1-p2);
21        else {
22             printf("x1 = %.2g + %.2gi, ", p1, p2);
23             printf("x2 = %.2g - %.2gi\n", p1, p2);
24        }
25     }
26     
27     return 0;
28 }

图片

实验3

源代码

 1 #include <stdio.h>
 2 #include <math.h>
 3 
 4 int main() {
 5     char c;
 6     while(scanf("%c", &c) != EOF){
 7     getchar();
 8     if(c=='r')
 9     printf("stop!\n");
10     else if(c=='g')
11     printf("go go go\n");
12     else if(c=='y')
13     printf("wait a minute\n");
14     else
15     printf("something must be wrong...\n");
16 }
17     return 0;
18 }

图片

实验4

源代码

 1 include <stdio.h>
 2 #include <math.h>
 3 
 4 int main() {
 5     double x, max, min, s = 0;
 6     scanf("%lf", &x);
 7     max = x;
 8     min = x;
 9     while(x>=0){
10         s = s + x;
11         if(x > max)
12         max = x;
13         if(x < min)
14         min = x;
15         scanf("%lf", &x);
16         if(x != -1)
17         continue;
18         
19     }
20     printf("今日累计消费总额：% .1lf\n今日最高一笔开销：% .1lf\n今日最低一笔开销：% .1lf\n",s ,max, min);
21     return 0;
22 }

图片

实验5

源代码

 1 #include <stdio.h>
 2 #include <math.h>
 3 
 4 int main() {
 5     int a, b, c;
 6     while(scanf("%d%d%d",&a, &b, &c) != EOF){
 7         if((a + b <= c) ||(a - b >= c))
 8         printf("不能构成三角形\n");
 9         else{
10             if(a == b&& b== c)
11             printf("等边三角形\n");
12             else if((a == b)&&(b != c)||(a == c)&&(c !=b)||(b == c)&&(b != a))
13             printf("等腰三角形\n");
14             else if((a^2 + b^2 == c^2)||(a^2 + c^2 == b^2)||(b^2 + c^2 == a^2))
15             printf("直角三角形\n");
16             else
17             printf("普通三角形\n");
18         }
19     }
20     return 0;
21 }

图片

实验6

源代码

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <time.h>
 4 
 5 int main() {
 6     srand(time(NULL));
 7     int random_no , n ,a;
 8     n = 0;
 9     random_no = rand()%30 + 1;
10     printf("猜猜2024年11月哪一天会是你的luckey day\n\n");
11     printf("开始喽，你有三次机会，猜吧（1~30）：", a);
12     while(n < 3){
13         scanf("%d", &a);
14         if(a == random_no){
15             printf("\n哇，猜中了:)");
16             break;
17         }
18         else if(a > random_no){
19             printf("\n你猜的日期晚了，你的luckey day在前面哦\n\n");
20         }
21         else {
22             printf("\n你猜的日期早了，你的luckey day在后面哦\n\n"); 
23         }
24         n++;
25         if(n <= 2)
26         printf("再猜（1~30）:");
27     }
28     if(n == 3){
29     printf("次数用光了，偷偷告诉你，11月你的luckey day是%d号\n", random_no);
30     }
31     
32     return 0;
33 }

图片