Question

根据DDD我从strcpy得到了一个seg错误但是我无法弄清楚我做错了什么（对C来说仍然很新）。非常感谢任何帮助，提前谢谢。

int compare_people(PERSON* first, PERSON* second)
{
    char firstName[32];
    char secondName[32];

    strcpy(firstName, first->name);
    strcpy(secondName, second->name);

    int returnVal = strcmp(firstName, secondName);

    return returnVal;
}

Answer 1

似乎第一个或第二个等于NULL或first-＆gt; name或second-＆gt; name等于NULL或具有由于使用strcpy超过32个字符的非零终止数据。另一个原因可能是first-＆gt; name或second-＆gt; name具有无效指针，例如指向已经销毁的本地数据的指针。

在功能中插入支票。例如

assert( first != NULL && second != NULL && 
        first->name != NULL && second->name != NULL &&
        strlen( first->name ) < 32 && strlen( second->name ) < 32 );

或者你可以在几个单独的断言中拆分这个断言。

Answer 2

 just  try that code.

   #include <stdio.h>
   #include <stdlib.h>
   #include <string.h>
   typedef struct{

     char name[25];
     }PERSON;

   int compare_people(PERSON* first, PERSON* second);
   main()
  {
    PERSON *first,*second;
    first=(PERSON *)malloc(sizeof(PERSON));
    printf("Enter the first name\n");
    scanf("%s",first->name);
    second=(PERSON *)malloc(sizeof(PERSON));
    printf("Enter the second name\n");
    scanf("%s",second->name);

    if((compare_people(first,second)) == 0)
       printf("Two names are same \n");
    else
      printf("Two names are different\n");


   }

   int compare_people(PERSON* first, PERSON* second)
   {
    char firstName[32];
    char secondName[32];

    strcpy(firstName, first->name);
    strcpy(secondName, second->name);

    int returnVal = strcmp(firstName, secondName);
    return returnVal

   }

〜

strcpy Seg Fault

2 个答案: