实验课作业2

实验任务-1

源代码

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

#define N 5

int main()
{
    int number;
    int i;

    srand(time(0));

    for (i = 0; i < N; ++i)
    {
        number = rand() % 500 + 1;
        printf("20228329%04d\n", number);
    }

    return 0;
}

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问题answer

1,赋给number一个1-500的随机数

2，打印输出一个随机学号

实验任务-2

源代码

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

int main()
{
    int i, n;
    srand(time(0));
    int a = rand() % 30 + 1;
    printf("猜猜2022年11月哪一天会是你的lucky day\n");
    printf("开始喽，你有三次机会，猜吧（1~30):\n");

    for (i = 1; i <= 3; ++i)
    {
        scanf_s("%2d", &n);
        if (n == a)
        {
            printf("哇，你猜对了：）");
            break;
        }
        else if (n < a)
        {
            printf("你猜的日期早了，你的lucky day还没到呢\n");
            if (i >= 3)
            {
                break;
            }
            printf("再猜:\n");

        }
        else if (n > a)
        {
            printf("你猜的日期晚了，你的lucky day已经过了\n");
            if (i >= 3)
            {
                break;
            }
            printf("再猜:\n");

        }
    }
        printf("次数用完了，偷偷告诉你;11月，你的lucky day是%d",a);


    

    return 0;
}

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实验任务-3

源代码

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

int main()
{
    char trafficlight;

    while (trafficlight=getchar(),getchar() != EOF)
        {
switch (trafficlight)
{
case 'r':printf("stop!\n"); break;
case 'g':printf("go go go\n"); break;
case 'y':printf("wait a minute\n"); break;
default:printf("something must be wrong...\n"); break;
}
        }
    return 0;
}

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实验任务-4

源代码

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

int main()
{
    char trafficlight;

    while (trafficlight=getchar(),getchar() != EOF)
        {
switch (trafficlight)
{
case 'r':printf("stop!\n"); break;
case 'g':printf("go go go\n"); break;
case 'y':printf("wait a minute\n"); break;
default:printf("something must be wrong...\n"); break;
}
        }
    return 0;
}

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实验任务-5

源代码

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

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

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实验任务-6

源代码

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

int main()
{
    int a, b, c, n;
    scanf_s("%d", &n);
    printf("input n:%d\n", n);
    for (a = 1; a <= n; ++a)
    {
        for (b = 1; b <= 5 * (a - 1); ++b)
        {
            printf(" ");
        }
        for (c = 1; c <= 2 * n - 2 * a + 1; ++c)
        {
            printf(" o   ");
        }
        printf("\n");
        for (b = 1; b <= 5 * (a - 1); ++b)
        {
            printf(" ");
        }
        for (c = 1; c <= 2 * n - 2 * a + 1; ++c)
        {
            printf("<H>  ");
        }
        printf("\n");
        for (b = 1; b <= 5 * (a - 1); ++b)
        {
            printf(" ");
        }
        for (c = 1; c<= 2*n-2*a+1; ++c)
        {
            printf("I I  ");
        }
        printf("\n");
    }
        return 0;
}

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1. 需打印2*n-2*i+1个小人

2. 需打印5*(i-1)个空格