实验二

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    char colour;
    while (scanf("%c", &colour) != EOF)
        if (colour >= 97 && colour <= 122)
            switch (colour)
            {
            case 'r':printf("stop!\n"); break;
            case 'g':printf("gogogo\n"); break;
            case 'y':printf("wait a munite \n"); break;
            default:printf("something is wrong\n"); break;

            }
    return 0;
}

 

 

#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) );//以当前系统时间作为随机种子

    for (i = 0; i < N; i++)
    {
        number = rand()%(N2 - N1 + 1);
        printf("202383290376%04d\n",number);

        system("pause");
    }

return 0;
}
/*line17的作用是为变量number附上一个在374到465之间随机值
程序的功能是输出一个随机学号*/

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

#define N 3
#define N1 1
#define N2 30
int main()
{
    int i;
    int date;
    int n;
    srand(time(0));
    date = rand() % (N2 - N1 + 1) + N1;
    
    printf("猜猜2023年11月那一天会是你的lucky day\n");
    printf("开始喽,你有三次机会猜吧(1~30):");
    for (i = 1; i <= N; i++)
    {
        scanf("%d", &n);
        if (n == date)
        {
            printf("哇猜中了:-)");
            break;
        }
        else
        {
            if (n < date)
            {
                printf("你猜的日期晚了,你的lucky day还没到呢\n");

            }
            else if (n > date)
            {
                printf("你的lucky day 已经过了\n");

            }
            if (i < N)
            {
                printf("再猜");
            }
            if (i == N)
            {
                printf("次数用完啦,偷偷告诉你:11月,你的lucky day是%d号", date);
            }

        }
    }

        return 0;
}

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

    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int i = 0;
    int j = 0;
    for (i = 1; i <= 9; i++)
    {
        for (j = 1; j <= i; j++)
        {
            printf("%d*%d=%-4d", j, i, j * i);
        }
        printf("\n");
    }





    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int n,i,z,t;
    printf("input:");
    scanf("%d", &n);
    z = n;
    while (n >= 1)
    {
        t = z - n;
        while (t > 0)
        {
            printf("\t");
            t--;
        }
        t = z - n;
        
        for (i = 2 * n - 1; i > 0; i--)
        {
            printf(" O \t");
        }
        printf("\n");
        while (t > 0)
        {
            printf("\t");
            t--;
        }
        t = z - n;
        for (i = 2 * n - 1; i > 0; i--)
        {
        printf("<H>\t");
        }
        printf("\n");
        while (t > 0)
        {
            printf("\t");
            t--;
        }
        for (i = 2 * n - 1; i > 0; i--)
        {
            printf("I I\t");
        }
        printf("\n");




        n--;
        printf("\n");
    }


    return 0;
}