我正在与 c 中的 strcmp 作斗争
我正在努力将用户输入与文件内容进行比较。基本上，我创建了一个更新员工详细信息的函数，该函数首先提示输入员工的姓名，然后将输入的姓名与文件中的姓名进行比较。我尝试这样做：
void update(EMPLOYEE *details)
{
FILE *file;
char search;
file = fopen("employees.txt","r");
if(file == NULL)
{
printf("File error!!!");
exit(0);
}
else
{
search = getc(file);
printf("Enter name: ");
scanf("%s",details->name);
if((strcmp(search,details->name) == 0))
{
printf("%s\n",details->name);
printf("%d",details->employeeNumber);
}
}
fclose(file);
}
i'm struggling to compare user input with the file contents. Basically i created a function that updates employee details that first prompts for the name of the employee and then it compares the name entered with those in the file. I tried doing this:
void update(EMPLOYEE *details)
{
FILE *file;
char search;
file = fopen("employees.txt","r");
if(file == NULL)
{
printf("File error!!!");
exit(0);
}
else
{
search = getc(file);
printf("Enter name: ");
scanf("%s",details->name);
if((strcmp(search,details->name) == 0))
{
printf("%s\n",details->name);
printf("%d",details->employeeNumber);
}
}
fclose(file);
}
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评论（3）
您正在将单个字符
search与（我假设）整个字符串details->name进行比较。strcmp的方法签名是：调用它：
不仅如此，如果您修复它以使其编译，您将读取您的 str1 字符缓冲区，除非它碰巧是字符 0，但事实并非如此。
要解决此问题，您必须执行以下操作之一：
You are comparing a single character,
searchwith (I assume) an entire string,details->name.The method signature for
strcmpis:You are calling it as:
Not only this, but you are going to read past your str1 character buffer if you fix it to make it compile unless it happens to be character 0, which it won't be.
To fix this, you must do one of the following:
strcmp采用字符串 (char *)，而不是单个字母。正如其他人在评论中提到的，您需要更新 getc 进程以读取多个字母。strcmptakes a string (char *) not a single letter. As others have mentioned in the comments, you need to update thegetcprocess to read more than the single letter.提示：
编辑：将 read 更改为 fread，因为它是 FILE*
hth
a hint:
EDIT: changed read to fread since it is a FILE*
hth