实验2

 

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

#define N 5
int main()
{
    int i,number;
    
    srand(time(0));
    
    for(i=0;i<=N;++i)
    {
        number=rand()%500+1; 
        
        printf("20228329%04d\n",number);
        
    }
    return 0;
 } 
 

 

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int i,j,number;
    
    printf("猜猜2022年11月哪一天会是你的lucky day\n");
    
    printf("开始喽，你有三次机会，猜吧(1~30):");
    srand(time(0));
    number=rand()%30+1;

    for(i=1;i<=3;++i)
    {   
        scanf("%d",&j);
        printf("\n");
            if(j<1||j>30)
            exit(0);
        if(j>number)
        printf("你猜的日期晚了，你的lucky day已经过啦\n");
        
        if(j<number)
        printf("你猜的日期早了，你的lucky day还没到呢\n");
        printf("再猜："); 
        if(j==number)
        {
            printf("哇，猜中了：—）");
            exit(0);
        }
        
    }
    printf("次数用完啦，偷偷告诉你：11月，你的lucky day是:%d号",number);
    
    
    
    
    
    
    
    return 0;
    
}

 

 

 

 

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

 

 

#include<stdio.h>


int main()
{
    double p,sum,b;
    int n,a,i;
    
    while(scanf("%d %d",&n,&a)!=EOF)
    {
        b=1;
        p=a;
        
        for(i=1,sum=0;i<=n;i++)
        {
            
            sum+=b/p;
            b=b+1;
            p=p*10+a;
            
            
        }
        printf("n=%d,a=%d,sum=%lf\n",n,a,sum);

        
    }
    
    
    return 0;
    
}

 

 

#include<stdio.h>
int main()
{
    int i,j,s;
    for(i=1;i<=9;++i)
  {
  
    for(j=1;j<=i;++j)
    {
        s=j*i;
        printf("%d*%d= %2d  ",j,i,s);
    }
     printf("\n");    
}
    return 0;
}

 

 

#include<stdio.h>
int main()
{
    int i, j, n, a, b,c,v,d,h;
    scanf_s("%d", &n);
    a = n;
    for (i = 1; i <= n; i++)
    {
        for (j = 1; j < i; j++)
            printf("\t");
        for (b = 1; b <= (2 * a - 1); b++)
            printf(" o \t");
        printf("\n");
        for (c = 1; c < i; c++)
            printf("\t");
        for (v = 1; v <= (2 * a - 1); v++)
            printf("<H>\t");
        printf("\n");
        for (d = 1; d < i; d++)
            printf("\t");
        for (h = 1; h <= (2 * a - 1); h++)
            printf("I I\t");
        printf("\n");
        a = a - 1;
    }
    return 0;
}