实验2 c语言控制语句应用编程

实验任务1

#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;
}

实验任务2

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 2
int main()
{
    int number;
    int i,n;
    srand(time(0));
    number = rand() % 31 + 1;
    printf("猜猜2022年11月哪一天会是你的lucky day\n开始喽，你有三次机会，猜吧(1-30):");
    scanf_s(" %d", &n);
    printf("\n");
    printf("\n");
    for (i = 0; i < N; ++i)
    {
        if (n <= 0 || n>31)
        {
            printf("输入的数据错误，请重新输入：");
            scanf_s(" %d", &n);
        }
        do
        {
            if (n >= 0 && n < number)
            {
                printf("你猜的日期早了，你的lucky day还没到呢\n\n再猜（1-30）：");
                scanf_s(" %d", &n);
                printf("\n");
                break;
            }
            if (n > number && n<31)
            {
                printf("你猜的日期晚了，你的lucky day已经过了\n\n再猜（1-30）:");
                scanf_s(" %d", &n);

                break;
            }

        } while (n != number && i < N);
        
        if (n == number)
            break;
    }
    if (n >= 0 && n < number)
        printf("你猜的日期早了，你的lucky day还没到呢\n\n");
    if (n > number && n <= 31)
        printf("你猜的日期晚了，你的lucky day已经过了\n\n");

            if (i == 2)
                printf("次数用完了。偷偷告诉你：11月，你的lucky day是%d号", number);
            else if (i < 2 && n == number)
                printf("哇，猜对了：-）\n");
        
        
    return 0;
}

实验任务3

#include<stdio.h>
#include<stdlib.h>
int main()
{
    char ans;
    while (scanf_s("%c",&ans,1) != EOF)
    {
        getchar();
        switch (ans)
        {
        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;
}

实验任务4

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n, a, i;
    while (scanf("%d %d", &n, &a) != EOF)
    {
        double s = 0.0, sum = 0.0;
        for (i = 1; i <= n; i++)
        {
            sum = sum*10 + a;
            s += i / sum;
        }
        printf("n=%d,a=%d,s=%lf\n", n, a, s);
    }

    return 0;
}

实验任务5

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int h, e,z;
    for (h=1;h<=9;h++)
    {
        for (e = 1; e <= h; e++)
        {
            z = h * e;
            printf(" %d x %d = %d ",e,h,z);
        }
        printf("\n");
    }
    return 0;
}

实验任务6

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int h, n,j,i;
    printf("input n:");
    scanf_s("%d", &n);
    for (h = 1; h <= n; h++)
    {
        for (j = 1; j <= (h - 1); j++)
            printf("\t");
        for (i = 1; i <= (2 * n - 1 - 2 * (h - 1)); i++)
        {
            printf(" o ");
            printf("\t");
        }
        printf("\n");
        for (j = 1; j <= (h - 1); j++)
            printf("\t");
            for (i = 1; i <= (2 * n - 1 - 2 * (h - 1)); i++)
            {
                printf("<H>");
                printf("\t");
    }
            printf("\n");
            for (j = 1; j <= (h - 1); j++)
                printf("\t");
            for (i = 1; i <= (2 * n - 1 - 2 * (h - 1)); i++)
            {
                printf("I I"); 
                printf("\t");
    }
            printf("\n");
            printf("\n");
    }
    return 0;
}