c中字符数组的串联 [英] concatenation of character arrays in c

问题描述

我正在尝试连接2个字符数组，但是当我尝试连接两个字符数组时，我的o / p控制台挂起并且不打印任何内容。

I am trying to concatenate 2 character arrays but when I try it does not work and my o/p console hangs and does not print anything.

   char *str[2];
   str[0] = "Hello ";
   str[1] = "World";
   strcat(str[0],str[1]);
   printf("%s\n",str[0]);

我什至尝试了下面的代码，但同样失败了

I even tried the below code which fails as well

   char *str1 = "Hello ";
   char *str2 = "World";
   strcat(str1,str2);
   printf("%s\n",str1);

有人可以解释吗？

TIA 。

推荐答案

此代码说明了问题：

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

int main(void)
{
    char *str1 = "Hello ";
    char *str2 = "World";
    char *ptr1, *ptr2;

    printf("Find the end of str1...\n");
    ptr1 = str1;
    while (ptr1[0] != '\0') {
        ptr1++;
    }
    printf("Copy str2 to the end of str1...\n");
    ptr2 = str2;
    while (ptr2[0] != '\0') {
        printf("Attempt to write to read-only memory...\n");
        ptr1[0] = ptr2[0];
        printf("We never get here.\n");
        ptr1++;
        ptr2++;
    }
    ptr2[0] = '\0';
    printf("Done.\n");
    return 0;
}

输出

Find the end of str1...
Copy str2 to the end of str1...
Attempt to write to read-only memory...
Bus error: 10

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