why g++ shows “gets()” not declared ,even after including

Question

#include 
#include 
#include 

using namespace std;

int main()
{
    char str[30];
    gets(str);
}

when

Answer 1

gets is an unsafe function and is not supported by the C Standard any more.

Instead use fgets.

For example

#include 
#include 
#include 

int main()
{
    char str[30];

    std::fgets(str, sizeof( str ), stdin );

    str[ std::strcspn( str, "\n" ) ] = '\0';

    //...
}