Gets function should have a prototype error is coming. What should i write.

Question

https://code.sololearn.com/c2RYwcM8F1ib/?ref=app

Answer 1

gets() has been removed since C++14.
You can't use it in modern C++.
It is C function.
In C++ there is getline() function;

Your code is mix of C and C++
If you want to use C++, you can rewite your code as follow:

#include <iostream>
#include <string>

using namespace std;

class read
{
string a,b;
public:
void display()
{
cout<<"enter the first string";
cin>>a;
cout<<"enter the second string";
cin>>b;
a+=b;
cout<<"strings obtained on concatenation "<<a<<"\n";
}
};
int main()
{
read r;
r.display();
getchar();
}

Answer 2

Disha Dey
What kind of errors?

May be you are using wrong (or old) compiler?
In your code was #include<conio.h>
It was used on DOS compilers.
gets was defined in stdio c-header file
you can try to include this header file if you are using old DOS compiler.

try this (you should enter 2 strings when you run program):
https://code.sololearn.com/c4iJF6vQU9L8

Answer 3

which compiler do you use?
turbo (borland) C?

Answer 4

Did you try to append
#include <stdio.h>
at the top of the file?

also semicolon in line #15 should be at the end of the line (not inside string).

I appended #include <stdio.h> in your file and fixed line#15
This code will not compile in CodePlayground!!!!!
Try to compile it with your turbo C++

https://code.sololearn.com/cc4o4o3N4Fgl

Answer 5

Disha Dey
because you use C function gets()
It is defined inside stdio.h file header.

Answer 6

If you don't want to use stdio.h
then you should not use gets function

use C++ streams:

cin>>a;

instead of gets(a);

and

cin>>b;

instead of gets(b);

Answer 7

I have also searched for this but I didn't get it , even professional haven't given answer for this . I don't know why but I will suggest you to don't use this declaration (gets())as this is very sensitive and hard to be mastered also no one cares this function with this c language .Thanks for asking your doubt🤗

Answer 8

Then what should i write instead of gets()

Answer 9

Mr. Dacco Samanta, by using Char* I'm still getting the error and apart from that 2 more errors are coming.

Answer 10

Mr.Andriy Kan, this program is showing 6 error and 1 warning.

Answer 11

Yes it's the old one. But i have tried the way you showed but still I'm getting error.

Answer 12

Yes

Answer 13

then add line at the top of your code:

#include <stdio.h>

function gets is defined inside it

Answer 14

Use getline(cin, stringname);

Answer 15

Mr. yash Tärkár, now getline should have a prototype error is showing.

Answer 16

Have you typed using namespace std; below the header files?

Answer 17

3 error are showing after writing namespace std;

Answer 18

But I'm doing c++ not c so why would be there <stdio.h >.