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C++で‘gets’ was not declared in this scopeエラー

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コンパイラのバージョン
g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516

ロベールのC++教室のweb版第54章を読んでいた。(最終更新日が2000.6.24)
getsを使用したとき下記のエラーが出た

error: ‘gets’ was not declared in this scope

コードは下記

File3.cpp
#include <stdio.h>
#include <string.h>

int main()
{
    FILE* pFile;
    char  buffer[512];
    int   i;

    printf("何か文字列を入力して下さい > ");
    gets(buffer);

    pFile = fopen("fprintf.txt", "w");
    fprintf(pFile, "%d\n", strlen(buffer));
    for(i = 0; buffer[i]; i++)
        fprintf(pFile, "%02X ", (unsigned char)buffer[i]);
    fclose(pFile);

    return 0;
}

getsではなくfgetsを使う。gets使用してはいけないらしい。

File3.cpp
#include<stdio.h>
#include<string.h>

int main(){

    FILE* pFile;
    char buffer[512];
    int i;

    printf("何か文字列を入力して下さい > ");
    fgets(buffer,256, stdin);
    //gets(buffer);

    pFile=fopen("fprintf.txt", "w");
    fprintf(pFile, "%d\n", strlen(buffer));
    for(i=0; buffer[i]; i++)
        fprintf(pFile, "%02X", (unsigned char)buffer[i]);

    fclose(pFile);

    return 0;

}

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