实验2

试验任务1

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

#define N 5
#define N1 397
#define N2 476
#define N3 21

int main(){
    int cnt;
    int random_major,random_no;
    
    srand(time(NULL));
    
    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("20248329%04d\n",random_no);
    }
    
    cnt++;
    }
    return 0;
}

问题一：随机获得N1到N2之间的一个三位数

问题二：随机生成1到21之间的一个整数

问题三：在11班，12班，奇安信班所有学号中随机生成一个学号

实验任务2

#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;
}

实验任务3

#include<stdio.h>
int main()
{
    char a;
    do{
    scanf("%c",&a);
    getchar();
    if (a=='y')
    {
    printf("wait a minute\n");
     } 
     
     else if(a=='g')
     {
     printf("go go go\n");
     }
     
     else if(a=='r')
     {
         printf("stop!\n");
     }
     
     else 
         printf("something must be wrong...\n");
    }
    
    while(1);
    
    
    return 0;
    
}

实验任务4

 1 #include<stdio.h>
 2 int main()
 3 {
 4     float sum=0;
 5     float num;
 6     float min=20000;
 7     float max=0;
 8     
 9     printf("ÊäÈë½ñÈÕ¿ªÏú£¬Ö±µ½-1ÖÕÖ¹\n"); 
10      
11         while(scanf("%f",&num)!=EOF){
12         
13         
14         if (num!=-1)
15         {
16         
17         sum+=num;
18         
19         if(num>max)
20         {
21         max=num;
22         }
23         else
24         {
25         max=max;
26         }
27         if(num<min)
28         {
29         min=num;    
30         }
31         else
32         {
33         min=min;
34         }
35           continue;
36         }
37         
38         else
39         {
40         break;
41         }
42         }
43         printf("½ñÈÕÀÛ¼ÆÏû·Ñ£º%.1f\n",sum); 
44             printf("½ñÈÕ×î¸ß¿ªÏú£º%.1f\n",max);
45             printf("½ñÈÕ×îµÍ¿ªÏú£º%.1f\n",min);
46         
47     return 0;
48     
49 }

实验任务5

 1 #include<stdio.h>
 2 int main()
 3 {   
 4     int a,b,c;
 5     while(scanf("%d%d%d",&a,&b,&c)!=EOF){
 6         if(a+b<=c||b+c<=a||a+c<=b)
 7         {
 8             printf("²»Äܹ¹³ÉÈý½ÇÐÎ"); 
 9         }
10         else if(a==b&&b==c)
11         {
12             printf("µÈ±ßÈý½ÇÐÎ"); 
13         }
14         
15         
16         
17         else if(a==b||a==c||b==c)    
18         {
19             printf("µÈÑüÈý½ÇÐÎ"); 
20         }
21         
22         else if (a*a+b*b==c*c||a*a==b*b+c*c||b*b==a*a+c*c)
23         {
24             printf("Ö±½ÇÈý½ÇÐÎ"); 
25         }
26         
27         
28         
29         else
30         printf("ÆÕͨÈý½ÇÐÎ"); 
31         
32     }
33     
34     return 0;
35         
36         
37     
38 }

实验任务6

 1 int date;
 2     #define N1 30
 3     int guess;
 4     int cnt;
 5     srand(time(NULL));
 6     
 7     date=rand()%30+1;
 8     printf("²Â²Â2024Äê11ÔÂÄÄÒ»Ìì»áÊÇÄãµÄlucky day\n");
 9     printf("¿ªÊ¼¿©£¬ÄãÓÐÈý´Î»ú»á£¬²Â°É(1~30):\n");
10     cnt=0;
11     
12     while(cnt<3){
13         
14         scanf("%d",&guess);
15         cnt++;
16         
17         if(guess<date)
18         {
19             printf("Äã²ÂµÄÈÕÆÚÔçÁË£¬ÄãµÄlucky day»¹Ã»µ½ÄØ\n");
20             printf("Ôٲ£¨1~30£©£º\n");
21             continue;
22             
23         }
24         
25         else if(guess>date)
26         {
27             printf("Äã²ÂµÄÈÕÆÚÍíÁË£¬ÄãµÄlucky dayÔÚÇ°ÃæÄØ\n");
28             printf("Ôٲ£¨1~30£©£º\n");
29             continue;
30         }
31         
32         else if(guess==date)
33         {
34             printf("ÍÛ£¬²ÂÖÐÁË\n");    
35             break;
36         }
37     
38             
39     }
40         while(cnt==3)
41         {
42             printf("´ÎÊýÓùâÀ²£¬ÍµÍµ¸æËßÄ㣬11ÔÂÄãµÄlucky dayÊÇ%d",date);
43             break;
44         }
45         return 0;
46 }