Member Avatar for iammfa

Hi,
This is small c++ guess game, I almost finished it, but when i tried compile it gave me an error: "Cannot open include file: 'stdlib': No such file or directory"
is this file part of c++ standard library..? why compiler can't find it?

here is my .cpp source:

/* HIGH/LOW GAME */
#include<iostream>
#include<windows.h>
#include<stdlib>
using namespace std;
/*
This program plays a simple game.The computer picks a random number 
from
0 to 100, and the user tries to guess the number.
*/
const int totchan=7;
void main()
{
 int number;        //the computer's random number
 int guess;         //the user's guess
 int chances=0,score=0,chanscor;        //chanscor stores score for 1
successful chance.
 char ans;
 do
 { clrscr();
   chances=score=0;
   cout<<"
				Welcome to the High/Low game.";
   cout<<"
			I will pick a random number from 0 to 100.";
   cout<<"
			    You must try to guess the number.
";
   randomize();
   number=(int)(rand()%100);
   chanscor=100/totchan;        //score for each successful chance
   do
   {
     cout<<"
	What is your guess? (0 to 100) ";
     cin>>guess;
     if((guess<0)||(guess>100))
     {
	cout<<"Sorry, but your guess "<<guess<<"must be from 0 to 100.";
     }
     else if(guess < number)
     {
	cout<<guess<<" is low.Try a higher number.";
     }
     else if(guess > number)
     {
	cout<<guess<<" is high.Try a lower number.";
     }
     else		//if correct number is guessed
     {			//number is correct, and the "do" loop will end below
	cout<<guess<<" is correct. Congratulations!";
	score=chanscor*(totchan-chances);   //score calculated for number of
chances left
	cout<<"
	Your score is "<<score<<endl;
        break;
     }
     chances++;
     if(guess!=number)
	 cout<<"

Now you have "<<totchan-chances<<"chances left."<<endl;
     if(chances==totchan)
	 { cout<<"

Only "<<totchan<<"chances are allowed.Better luck next
time";
	   cout<<"
The actual number was "<<number<<endl;
	   break;
	 }
     }while (guess!=number);
     cout<<"

Thank you for playing High/Low!";
     cout<<"Want to play it again? (y/n)...";
     cin>>ans;
   }while(ans=='y' || ans=='Y');
 }
  • 4 Contributors
  • 5 Replies
  • 202 Views
  • 6 Hours Discussion Span
  • Latest Post Latest Post by RayvenHawk

Dani AI

Generated

As 's compile error indicates, the immediate symptom was an incorrect include name (see ). A concise, portable rule for C++: prefer the C++ wrapper headers (for example, use <cstdlib> rather than relying on a plain C header name), and qualify C functions with std:: when using the C++ headers. Some compilers make C names available in the global namespace, but portable code should not rely on that.

A minimal, robust pattern for simple random-number games is shown below. It uses the C++ headers and seeds the generator with the current time:

#include <cstdlib>
#include <ctime>
#include <iostream>

int main() {
    std::srand(static_cast<unsigned>(std::time(nullptr)));
    int secret = std::rand() % 100 + 1;
    std::cout << "Secret: " << secret << '\n';
}

conio.h and functions such as clrscr() / getch() are non-standard. They may exist in some Windows toolchains but reduce portability and can hide input/flush issues. For simple console interaction prefer standard facilities (std::getline, std::cin.get()), and for more control use a proven console library (ncurses / PDCurses) rather than vendor-specific headers.

For user-response handling (the play-again prompt), use std::string and std::getline to avoid leftover-newline problems; check the first character for 'y'/'Y' rather than reading a single char. Finally, if a correct header name still fails to be found, verify that the source file has a .cpp extension, the project is configured to build as C++, and the compiler include paths in the IDE are intact — missing headers can indicate a misconfigured toolchain rather than bad code.

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Member Avatar for FrozenSnake

stdlib.h you forgot the .h :]

#include <iostream>
#include <windows.h>
#include <stdlib.h> // or #include<cstdlib>
using namespace std;
const int totchan=7;
int main()
{
    int number;        //the computer's random number
    int guess;         //the user's guess
    int chances=0,score=0,chanscor;        //chanscor stores score for 1 successful chance.
    char ans;
    do
    {
        //clrscr();
        chances=score=0;
        cout<<"Welcome to the High/Low game.";
        cout<<"I will pick a random number from 0 to 100.";
        cout<<"You must try to guess the number.";
        //randomize();
        number=(int)(rand()%100);
        chanscor=100/totchan;        //score for each successful chance
        do
        {
            cout<<"hat is your guess? (0 to 100) ";
            cin>>guess;
            if((guess<0)||(guess>100))
            {
                cout<<"Sorry, but your guess "<<guess<<"must be from 0 to 100.";
            }
            else if(guess < number)
            {
                cout<<guess<<" is low.Try a higher number.";
            }
            else if(guess > number)
            {
                cout<<guess<<" is high.Try a lower number.";
            }
            else		//if correct number is guessed
            {			//number is correct, and the "do" loop will end below
                cout<<guess<<" is correct. Congratulations!";
                score=chanscor*(totchan-chances);   //score calculated for number of chances left
                cout<<"Your score is "<<score<<endl;
                break;
            }
            chances++;
            if(guess!=number)
                cout<<"Now you have "<<totchan-chances<<"chances left."<<endl;
            if(chances==totchan)
            {
                cout<<"Only "<<totchan<<"chances are allowed.Better luck next time";
                cout<<" The actual number was "<<number<<endl;
                break;
            }
        }while (guess!=number);
        cout<<"Thank you for playing High/Low!";
        cout<<"Want to play it again? (y/n)...";
        cin>>ans;
    }while(ans=='y' || ans=='Y');
}
Edited by FrozenSnake because: n/a
Member Avatar for SgtMe

is stdlib a header, or do you use cstdlib?

Member Avatar for iammfa

Thanks FrozenSnake, code worked well ..
what is header conio.h, is it important in c++ 2008 express

Member Avatar for FrozenSnake

Thanks FrozenSnake, code worked well ..
what is header conio.h, is it important in c++ 2008 express

I have never used conio.h in any IDE's I used. If you want to read about it you can read here:
http://en.wikipedia.org/wiki/Conio.h

Member Avatar for RayvenHawk

Hi,
This is small c++ guess game, I almost finished it, but when i tried compile it gave me an error: "Cannot open include file: 'stdlib': No such file or directory"
is this file part of c++ standard library..? why compiler can't find it?

here is my .cpp source:

Ok lets fix the first issue, in order to get stdlib to work add a .h to the end of it (i.e. #include <stdlib.h>)

Secondly your formatting is horrible. Your cout's are all done incorrectly, you have functions that are inproper such as line 51: that is an invalid line of code, as is line 19 and line 22 (well the { is valid, the clrscr() is not (nor is it necessary).

Lastly aside from sentence structures, your last while statement is improper, first change the char ans to string ans (don't forget to add the string header to the top), and then the while statement should be (ans == "y" || ans == "Y"). Also you need to add this line to your if(chances==totchan) call:
guess = number;

Otherwise if you keep guessing the wrong number the game will continue playing until you get the number correct. This way if you still miss it, the game will end correctly and allow you to either exit or try again.

After removing the bad parts and fixing the cout structures I was able to compile and run your program.

Edited by RayvenHawk because: n/a
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