实验二

#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){
        number=rand()%(N2-1+1)+N1;
        printf("202383290376%04d\n",number);
    }
    return 0;
}

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

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int day;
    srand(time(0));
    day=rand()%30+1;
    int chance;
    int guess;
    printf("猜猜2023年11月哪一天会是你的lucky day,你有三次机会:");
    for(chance=3;chance>0;chance--){
        scanf("%d",&guess);
        if(guess==day){
            printf("right!\n");
            return 0;
        }
        else if(guess>day){
            printf("too late!\n");
        }
        else if(guess<day){
            printf("too early!\n");
        }
        else{
            printf("再猜:");
        }
        
        
    }
    return 0;
    
    
    
    
 } 

#include<stdio.h>
int main()
{
    int n,a;
    int i;
    double s=0;
    while(scanf("%d%d",&n,&a)!=EOF){
        int l=1;
        double sum=0;
        for(i=1;i<=n;i++){
            s=(i*1.0)/(a*1*1.0);
            sum=sum+s;
            l=l*10+1;
        }
        
        printf("n=%d,a=%d,s=%lf\n",n,a,sum);
        
    }
    
    
    
 } 

#include<stdio.h>
int main()
{
    int n=9;
    int i=1;
    int j;
    while(i<=n){
        j=1;
        while(j<=i){
            if(j*i<10){
                printf("%d%d=%d",j,i,j*i);
            }
            else{
                printf("%d%d=%d",j,i,j*i);
            }
            j++;
        }
        i++;
        printf("\n");
    }
    return 0;
    
 } 

#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int n1=n;
    
    int s;
    int space;
    
    for(n=n;n>0;n--){
        for(space=n1-n;space>0;space--){
            printf("\t");
        }
        for(s=2*n-1;s>0;s--){
            printf(" 0\t");
        }
        printf("\n");
        
        
        for(space=n1-n;space>0;space--){
            printf("\t");
        }
        for(s=2*n-1;s>0;s--){
            printf("<H>\t");
        }
        printf("\n");
        
        
        for(space=n1-n;space>0;space--){
            printf("\t");
        }
        
        for(s=2*n-1;s>0;s--){
            printf("I I\t");
        }
        for(space=n1-n;space>0;space--){
            printf("\t");
        }
        printf("\n");
    }
    return 0;
}