While loop difficulties

[Rampie12]

Task-

Ask the user to enter a number between 5 and 8 (inclusive).

Use a while loop to validate the choice. It should continue until the user puts the correct number

I am stuck here

My soln so far-

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
    
int input;    

cout<<"Enter a number between 4 and 9:\n";  
cin>>input;  
while (5>input||input>8)
      cout<<"Invalid number, please try again:\n";
      

}

This throws me into an infinite loop. I can't seem to understand the problem. Help!

[jumper007]

You just failed to add the "{" at start of the while.

So, your code should be:

#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
   int input;    

   cout<<"Enter a number between 4 and 9:\n";  
   cin>>input;  

   while (5>input||input>8)
   {
         cout<<"Invalid number, please try again:\n";
   }
}

EDIT: Sorry. My fault. Didn't see that the "}" was from main, not from while.

[Rampie12]

Still getting same problem even when i incorperate "{"

[jumper007]

Could you post the entire code ? (if this is part of a larger cpp file)

[Rampie12]

This is it ;x I'm new to this. sorry

[jumper007]

What program did you use to compile this code ?

[Rampie12]

dev c++

[jumper007]

Well yes. It's kinda' infinite loop. You just ask for ONE number. The "while" statement runs for the number you entered. But after that, it won't stop unless you use a "break;" or a "goto"

[jumper007]

Do you want the program to ask the user if he wants to try entering another number when the number is invalid ?

If yes, you must use a "goto" or maybe a more simple way. If not, you got to use "break;".

[Rampie12]

Yes I want the user to keep inputing a number until he gets it right. I am familiar with break to end the loop, but not with goto?

[jumper007]

Here is the code:

#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
   int input;
   char ok;    

   cout<<"Enter a number between 4 and 9:\n";  
   cin>>input;  

   while (5>input||input>8)
   {
      cout<<"Invalid number, please try again:\n";
      cout << "Try with other number ("y" = yes / "n" = no) ?\n";
      cin >> ok;
      if (ok == 'y');
          cin >> input;
      else
      {
          if (ok == 'n')
              cout << "You have chosen to exit.";
          break;
      }
   }

   return 0;
}

[jumper007]

Hope I could help :)
And about the goto... If you are new, you can just learn about it later. For the moment you got to understand simple codes.

[Rampie12]

What if I didn't want it to be an option to select another number, just wanted the program to automatically prompt the use for another number. is that possible? ._.

[clanmjc]

Then remove the both cout statements and just have the cin >> input. Then remove the if else block and the break.

So basically...

while (5>input||input>8)
{
cin >> input;
}

//What you want to do after the correct number entered..