源代码

/***************************************************
 * Copyright: 2023, 黄子涵.
 * File name: huangzihan_c_program_142
 * Description: 改变指针的值
 * Author: 黄子涵
 * Version: V1.0.0
 * Date: 2023-01-08
 * ****************************************************/

#include <stdio.h>

char huangzihan[10];
char huangchunqin[12];
char chenlanying[12];
char shejiazi[8];
void name_input();
void name_output();
void name_output_n();

void name_input()
{
    int i;
    printf("*********************************\n");
    printf("     给字符数组输入对应的名字    \n");
    printf("*********************************\n");
    printf("请输入黄子涵的小写拼音：");
    for (i = 0; i < 10; i++)
    {
        scanf("%c", &huangzihan[i]);
        if (huangzihan[i] == 10)
        {
            huangzihan[i] = '\0';
            break;
        }
    }
    getchar();
    printf("请输入黄春钦的小写拼音：");
    for (i = 0; i < 12; i++)
    {
        scanf("%c", &huangchunqin[i]);
        if (huangchunqin[i] == 10)
        {
            huangchunqin[i] = '\0';
            break;
        }
    }
    getchar();
    printf("请输入陈兰英的小写拼音：");
    for (i = 0; i < 11; i++)
    {
        scanf("%c", &chenlanying[i]);
        if (chenlanying[i] == 10)
        {
            chenlanying[i] = '\0';
            break;
        }
    }
    getchar();
    printf("请输入佘佳梓的小写拼音：");
    for (i = 0; i < 8; i++)
    {
        scanf("%c", &shejiazi[i]);
        if (shejiazi[i] == 10)
        {
            shejiazi[i] = '\0';
            break;
        }
    }
    printf("\n");
}

void name_output()
{
    char *p1,*p2,*p3,*p4;
    printf("*********************************\n");
    printf("     将字符数组对应的名字输出    \n");
    printf("*********************************\n");
    printf("输出huangzihan：");
    p1 = huangzihan;
    printf("%s", p1);
    printf("\n");
    printf("输出huangchunqin：");
    p2 = huangchunqin;
    printf("%s", p2);
    printf("\n");
    printf("输出chenlanying：");
    p3 = chenlanying;
    printf("%s", p3);
    printf("\n");
    printf("输出shejiazi：");
    p4 = shejiazi;
    printf("%s", p4);
    printf("\n");
}

void name_output_n()
{
    int i;
    char *p;
    printf("\n");
    printf("*********************************\n");
    printf("           改变指针的值          \n");
    printf("*********************************\n");
    printf("你要从第几个字符输出huangzihan（共10个字符）？");
    scanf("%d", &i);
    p = huangzihan + i - 1;
    printf("这是你要输出的字符串：%s", p);
    printf("\n");
    printf("你要从第几个字符输出huangchunqin（共12个字符）？");
    scanf("%d", &i);
    p = huangchunqin + i - 1;
    printf("这是你要输出的字符串：%s", p);
    printf("\n");
    printf("你要从第几个输出chenlanying（共11个字符）？");
    scanf("%d", &i);
    p = chenlanying + i - 1;
    printf("这是你要输出的字符串：%s", p);
    printf("\n");
    printf("你要从第几个输出shejiazi（共8个字符）？");
    scanf("%d", &i);
    p = shejiazi + i - 1;
    printf("这是你要输出的字符串：%s", p);
    printf("\n");
}

int main()
{
    extern char huangzihan[10];
    extern char huangchunqin[12];
    extern char chenlanying[12];
    extern char shejiazi[8];
    name_input();
    name_output();
    name_output_n();
    return 0;
}

一开始以为是没有添加字符串的结束标记的问题，但添加了字符串的结束标记后发现不起作用，添加代码如下：

if (shejiazi[i] == 10) {
        shejiazi[i] = '\0';
        break;
    }

我要输出结果

输出huangzihan：huangzihan
输出huangchunqin：huangchunqin
输出chenlanying：chenlanying
输出shejiazi：shejiazi

实际输出结果

我想知道为什么会这样，如果你知道，请告诉我，非常感谢。