implicit declaration of function ‘gets’; did you mean ‘fgets’? [-Wimplicit-function-
时间: 2024-03-06 16:42:43 浏览: 21
这个错误是因为在代码中使用了未声明的gets函数,而应该使用fgets函数。gets函数已经被弃用,因为它不提供缓冲区溢出保护。相反,fgets函数可以指定读取的最大字符数,从而避免缓冲区溢出。下面是一个使用fgets函数的示例:
```c
#include <stdio.h>
#define MAXLINES 1000
int main() {
char cmdInputStream[MAXLINES]; fgets(cmdInputStream, MAXLINES, stdin);
printf("%s", cmdInputStream);
return 0;
}
```
相关问题
implicit declaration of function ‘gets’; did you mean ‘fgets’? [-Wimplicit-function-declaration] gets(str);
This warning message is indicating that the function `gets()` has been used without being declared explicitly in the code. This could cause issues during compilation or execution of the program.
The warning message is suggesting to use the function `fgets()` instead, which is a safer alternative to `gets()`. `fgets()` takes an additional parameter specifying the maximum number of characters to read, which helps prevent buffer overflows.
To fix this warning, replace the line `gets(str);` with `fgets(str, sizeof(str), stdin);` where `str` is the character array to store the input and `stdin` is the standard input stream. This will ensure that the input is read safely and without any buffer overflows.
warning: implicit declaration of function ‘gets’; did you mean ‘fgets’? [-Wimplicit-function-declaration] gets(s);
这不是一个问题,而是一个编译警告,因为你在代码中使用了 gets() 函数,但这个函数在最新的 C 语言标准中已经被废弃了,因为它存在缓冲区溢出的安全问题。建议使用替代函数 fgets(),这个函数能够指定缓冲区大小,更加安全。如果你想继续使用 gets() 函数,可以加上编译选项 -Wno-deprecated-declarations 来关闭警告。