实验2

实验2

task 1

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

#define N 5
#define N1 374
#define N2 465

int main()
{
    int number;
    int i;
    
    srand(time(0));
    
    for(i=0;i<N;++i){
        numnber=rand()%(N2-N1+1)+N1;
        printf("202383290442%04d\n",number);
    }
    ststem("pause");
    return 0;
}

 运行结果

 

task 2

1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 int main()
 5 {    char x;
 6 
 7     while(scanf("%c",&x) != EOF){
 8         if(x == 'y')
 9             printf("wait a minute\n");
10         else if(x == 'g')
11             printf("go go go\n");
12         else if(x == 'r')
13             printf("stop\n");
14         else printf("something must be wrong...\n");
15     getchar();
16     }
17     
18 
19 
20 
21     system("pause");
22     return 0;
23 }

运行结果

 

task3

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <time.h>
 4 
 5 int main()
 6 { int day,d,i;
 7     srand(time(0));    
 8     day = rand()%30 + 1;
 9 
10     printf("猜猜2023年11月哪一天会是你的lucky day\n");
11     printf("开始喽，你有三次机会，猜吧（1~30）:");
12     scanf("%d",&d);
13 
14     for(i = 1; i < 3; i++){
15 
16     if(d == day){
17         printf("哇，猜中了：-)\n");
18         system("pause");
19         return 1;
20     }
21     else if(d < day)
22         printf("你猜的日期早了，你的lucky day还没到呢\n");
23     else printf("你猜的日期晚了，你的lucky day已经过啦\n");
24 
25     printf("再猜(1~30):");
26     scanf("%d",&d);
27     }
28 
29     printf("次数用完啦。偷偷告诉你：11月，你的lucky day是%d\n",day);
30 
31     system("pause");
32     return 0;
33 }

运行结果

task4

1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <math.h>
 4 
 5 int main()
 6 {    int n,a,i;
 7     double s;
 8     
 9     while(scanf("%d%d",&n,&a) != EOF){
10         k = s = 0;
11         for(i = 1; i <= n; i++){
12             k = 10*k +1;
13             s += 1.0*i/a/k;
14         }
15         printf("n = %d, a = %d, s = %lf",n,a,s);
16     }
17     
18     system("pause");
19     return 0;
20 }

运行结果

 

task5

1 #include <stdio.h>
 2 #include <stdlib.h>
 4 
 5 int main()
 6 {    int i,j,ans;
 7     for(i = 1; i <= 9; i++){
 8         for(j = 1; j <= i; j++){
 9             ans = i*j;
10             printf("%dx%d = %2d  ",j,i,ans);
11         }
12     printf("\n");
13     }
14     system("pause");
15     return 0;
16 }

运行结果

task 6

1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 int main()
 5 {    int n;
 6     int i,j,k;
 7 
 8     scanf("%d",&n);
 9 
10     for(i = 1; i <= n; i++){
11         for(j = 1; j < i ; j++)
12             printf("\t");
13         for(k = 1; k <= 2*(n + 1) - 1 - 2*i; k++)
14             printf(" O \t");
15         printf("\n");
16 
17         for(j = 1; j < i ; j++)
18             printf("\t");
19         for(k = 1; k <= 2*(n + 1) - 1 - 2*i; k++)
20             printf("<H>\t");
21         printf("\n");
22 
23         for(j = 1; j < i ; j++)
24             printf("\t");
25         for(k = 1; k <= 2*(n + 1) - 1 - 2*i; k++)
26             printf("I I\t");
27         printf("\n");
28     }
29 
30     system("pause");
31     return 0;
32 }

运行结果