实验二

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

#define N 5

int main()
{
    int grade,number;
    int i;
    
    srand (time(0));
    
    for (i=0;i<N;++i)
    {
        grade=rand()%4+2018;
        number=rand()%999+1;
        printf("%d8330%04d\n",grade,number);
    }
    return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int i,j=1,k;
    printf("猜猜2022年四月哪一天是你的lucky day");
    printf("开始了，你有三次机会，猜吧（1~30）：");
    srand(time(0));
    i=rand()%30+1;
    while(j<4)
    {
        scanf("%d",&k);
        if(k<i)
        {
            printf("你猜的日期早了哦，你的lucky day还没有到呢！\n");
            printf("再猜猜看：");
        }
        else if(k>i)
        {
        printf("你猜的日期晚了哦，你的lucky day已经过啦！\n");
        printf("再猜猜看：");
         }
         else if(k=i)
         {
             printf("恭喜你，猜中了！");
             break;
         }
         j++;
}
if(j==4)
printf("次数用完了，偷偷告诉你：4月，你的幸运日是%d号",i);
return 0;
}
#include<stdio.h>
#include<stdlib.h>
int main()
{
    char c;
    while(scanf("%c",&c)!=EOF)
    {
        if(c=='y')
        printf("wait a minute..\n");
        else if(c=='r')
        printf("STOP!!!!\n");
        else if(c=='g')
        printf("gogogo ：）\n");
        else
        printf("something must be wrong..");
        
        scanf("%c",&c);
    }
    return 0;
}

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

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main()
{
    int a,n,i,j;
    double s=0.0,t=0.0;
    while(1)
    {
        scanf("%d%d",&n,&a);
        for(i=1;i<=n;i++)
        {
            t=t*10+a;
            s+=i/t;
        }
        printf("a=%d,n=%d,s=%lf\n",a,n,s);
    }
    return 0;
}

#include <stdio.h>

int main()
{
int column,line;
for(column=1;column<=9;column++)
{
for(line=1;line<=column;line++)
{
printf("%dx%d=%2d ",line,column,line*column);
}
printf("\n");
}
return 0;
}

#include <stdio.h>

int main()
{
int j,i;
printf("input n:");
scanf("%d",&i);
for(j=1;j<=i;j++)
{
printf(" o \n");
printf("<H>\n");
printf("I I\n\n");
}
return 0;
}

#include <stdio.h>

int main()
{
int i,j;
printf("input n:");
scanf("%d",&i);

for(j=1;j<=i;j++)
{
printf(" o ");

}
printf("\n");


for(j=1;j<=i;j++)
{
printf("<H> ");

}
printf("\n");


for(j=1;j<=i;j++)
{
printf("I I ");

}
printf("\n");

return 0;
}

#include<stdio.h>
int main()
{
int N,m,n,a;
printf("input n：");
scanf("%d", &N);
for (m = 1; m <= N; m++)

{
for (n = 0; n <= m; n++)
printf("\t");

for (a = 0; a < N * 2 + 1 - m * 2; a++)
printf(" o \t");
printf("\n");

for (n = 0; n <= m; n++)
printf("\t");

for (a = 0; a < N * 2 + 1 - m * 2; a++)
printf("<H>\t");
printf("\n");

for (n = 0; n <= m; n++)
printf("\t");

for (a = 0; a < N * 2 + 1 - m * 2; a++)
printf("I I\t");
printf("\n");

}
return 0;
}