实验2

#include <stdio.h> 
#include <stdlib.h>
#include <time.h>
#define N 5 
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() % 500 + 1;
        printf("20228329%04d\n", number);
    }
    return 0;

}

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


int main()
{
    int x, y, i=1;
    y = rand() % 31 + 1;
az:printf("请输入你的luckyday");
    i++;
    scanf_s("%d", &x);
    if (x > y&&i<=3)
    {
        printf("戳啦，已经过了"); goto az;
    }
    else if (x < y&&i<=3)
    {
        printf("戳啦，早啦"); goto az;
    
    }
    else if (i > 3)
    {
        printf("应该是%d", y);
    }
    else
    {
        printf("对滴");
    }
    return 0;
}

#include <stdio.h>
int main()
{
    char L;
    printf("交通信号灯是什么颜色的？\n红色r\n绿色g\n黄色y\n请输入\n");
    scanf_s("%c", &L, 1);
    do
    {
        printf("交通信号灯是什么颜色的？\n红色r\n绿色g\n黄色y\n请输入\n");
        switch (L)
        {
        case 'r': { printf("stop\n"); break; }
        case 'g': { printf("fucking go\n"); break; }
        case 'y': {printf("wait~~~~\n"); break; }
        default: {printf("there is must something wrong\n"); break; }
        }
        getchar();

    } while (scanf_s("%c", &L, 1) != EOF);
    return 0;
}

/*#include <math.h>
#include <stdio.h>
double test (int n ,int a);
int main()
{
    int a, n, i = 1;
    double s;
    do
    {
        printf("pleaase enter n and a");
        scanf_s("%d%d", &n,&a);
        s = test(n, a);
        printf("\ns=%f", s);
        i++;
    } while (i <= 5);



        return 0;
}
 double test(int n,int a)
{
    int i;
    double s = 0;
    for (i = 1; i <= n;i++)
    {
        s += i / pow(a, i);

    }
    return s;
}

#include <stdio.h>
void raw(int n);

#include <math.h>
#include <stdlib.h>
#include<stdio.h>
int main()
{
    int i, n, a, b;
    scanf_s("%d", &i,3);
    printf("%d\n", i);
    for (n = 1; n <= i; n++)
    {
        for (b = 1; b < n; b++)
        {
            printf("   ");
        }
        for (a = 1; a <= 2 * i + 1 - 2 * n; a++)
        {
            printf(" o  ");
        }
        printf("\n");
        for (b = 1; b < n; b++)
        {
            printf("   ");
        }
        for (a = 1; a <= 2 * i + 1 - 2 * n; a++)
        {
            printf("<H> ");

        }
        printf("\n");
        for (b = 1; b < n; b++)
        {
            printf("   ");
        }
        for (a = 1; a <= 2 * i + 1 - 2 * n; a++)
        {
            printf("I I ");

        }
        printf("\n");
    }
    return 0;
}

 

int main()
{
    int i;
    for (i = 1; i <= 9; i++)
    {
        raw(i);
        printf("\n");
    }
    return 0;

}
void raw(int n)
{
    int i;
    for (i = 1;i <= n; i++)
    {
        printf("%d*%d=%d   ", i, n, i * n);
    }


}