实验2

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#define _CRT_SECURE_NO_WARNINGS
#include<stdio.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;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<time.h>
int main()
{
    int date, i, n = 3, num;
    date = rand() % 30;
    srand(time(0));
    printf("猜一猜2022年4月哪一天是你的lucky day\n开始了，你有三次机会，猜吧（1~30）：");
    for (i = 0; i < n; i++)
    {
        scanf("%d", &num);
        if (num == date)
            printf("哇！猜中了！");
        else if (num < date)
            printf("你猜的日期早了，你的lucky day还没到呢\n再猜（1~30）：");
        else
            printf("你猜的日期晚了，你的lucky day已经过了\n再猜（1~30）：");

        }
    if (i == n)
        printf("你的次数用完了，偷偷告诉你，4月，你的lucky day是%d号", date);
    return 0;
}

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

return 0;
}

 

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

#include<stdio.h>
int main()
{
    int i, j;
    for (i = 1; i < 10; i++)
    {
        for (j = 1; j <= i; j++)
            printf("%dX%d = %2d   ", j, i, i * j);
        printf("\n");
    }
    return 0;
}

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int i, j;
    printf("Input n: " );
    scanf("%d", &i);
    
    for (j = 0; j < i; j++)
    {
        printf(" O \n");
        printf("<H>\n");
        printf("I I\n\n");
    }
return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int i, n;
    printf("Input n: ");
    scanf("%d", &n);
    
    for (i = 0; i < n; i++)
        printf(" O     ");
    printf("\n");
    for(i=0;i<n;i++)
        printf("<H>    ");
    printf("\n");
    for(i=0;i<n;i++)
        printf("I I    ");
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int i, n;
    printf("Input n: ");
    scanf("%d", &n);
    
    for (i = 0; i < n; i++)
        printf(" O     ");
    printf("\n");
    for(i=0;i<n;i++)
        printf("<H>    ");
    printf("\n");
    for(i=0;i<n;i++)
        printf("I I    ");
    return 0;
}

 

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