实验2

 2021/11/14 16:21:24
#include<stdio.h>
int main() {
    int num;

    scanf_s("%d", &num);
    printf("2049%04d\n", num);

    scanf_s("%d", &num);
    printf("2049%04d\n", num);

    scanf_s("%d", &num);
    printf("2049%04d\n", num);

    return 0;
}

 2021/11/14 16:21:51

 

#include<stdio.h>
int main() {
    int num;

    while (1) {
        scanf_s("%d", &num);
        printf("2049%04d\n", num);
    }

    return 0;
}

 

 #include <stdio.h>
int main()
{
    char ans1, ans2;
    printf("复习了没? (输入y或Y表示复习了，输入n或N表示没复习) : ");
    ans1 = getchar();
    getchar();
    printf("\n动手敲代码了没? (输入y或Y表示敲了，输入n或N表示木有敲) : ");
    ans2 = getchar();
    if ((ans1 == 'y' || ans1 == 'Y') && (ans2 == 'y' || ans2 == 'Y'))
        printf("\n罗马不是一天建成的:)\n");
    else
        printf("\n罗马不是一天毁灭的。。。\n");
        return 0;
}

 

 

 

 2021/11/14 17:06:54
#include <stdio.h>
int main()
{
    char x;

    x = getchar();
    
        if (x >= '0' && x <= '9')
            printf("%c是数字字符\n", x);
        else if (x >= 'A' && x <= 'Z' || x >= 'a' && x <= 'z')
            printf("%c是英文字母\n", x);
        else
            printf("%c是其它字符\n", x);
    
    return 0;
}

 2021/11/14 17:07:13

 

 

 

#include<stdio.h>
int main()
{
    while (1){
    int n, a, i;
    double p, q;
    scanf_s("%d%d", &n, &a);
    p = 0;
    q = a;
        for (i = 1; i <= n; i++)
        {
            p = p + i / q;
            q = q * 10 + a;
        }
        printf("n = %d, a = %d, sum = %f\n", n, a, p);
    }
    return 0;
}

 

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

const int N = 5;

int main()
{
    int x, n;

    srand(time(0));

    for (n = 1; n <= N; n++)
    {
        x = rand() % 100;
        printf("%3d", x);
    }

    printf("\n");

    return 0;
}

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
    int x, y, i;
    srand(time(0));
    x = rand() % 31 + 1;
    printf("猜猜2021年12月哪一天会是你的lucky day\n");
    printf("\n开始咯，你有三次机会，猜吧（1~31）：");
    for (i = 1; i <= 3; i++)
    {
        scanf_s("%d", &y);
        if (x == y) {
            printf("\n猜对啦，恭喜\n");
            break;
        }
        else if (y > x)
        {
            printf("\n你猜的日期晚了，luck day悄悄溜到前面啦\n");
            printf("\n再猜（1~31）:");
        }
        else if (y < x)
        {

            printf("\n你猜的日期早了，lucky day还没到呢\n");
            printf("\n再猜（1~31）:");
        }
    }
    if (i == 4)
        printf("\n次数用完啦。偷偷告诉你：12月，你的luck day是%d号\n", x);
    return 0;
}

 

 12:31:50
#include<stdio.h>
int main() {
    int n, i;
    scanf_s("%d", &n);
    for (i = 0; i < n; i++)
    {
        printf(" o\n");
        printf("<H>\n");
        printf("I I\n");

    }
    return 0;
}

 12:32:04

 

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

 

#include<stdio.h>
int main() {
    int m, n, i, j, q;
    scanf_s("%d", &n);
    m = n;
    for (j = 1; j <= n; j++)
    {
        for (q = 0; q < j; q++)
            printf("\t");

        for (i = 0; i < (2 * m - 1); i++)
            printf(" o\t");
        printf("\n");

        for (q = 0; q < j; q++)
            printf("\t");


        for (i = 0; i < (2 * m - 1); i++)
            printf("<H>\t");
        printf("\n");

        for (q = 0; q < j; q++)
            printf("\t");

        for (i = 0; i < (2 * m - 1); i++)
            printf("I I\t");
        printf("\n");
        m -= 1;

    }
    return 0;
}