user input

[metalinc]

hi,
what function can be used to make sure that the user input must be seven digits?

int number;
do
{      cout<<"Enter NUMBER"<<endl;
       cin>>number;
       if ()
       cout<<"Please enter NUMBER with seven digits"<<endl<<endl;
 
}
while();

[weaknessforcats]

Enter tha data as an integer and check that it is >999999 and <10000000

[metalinc]

Enter tha data as an integer and check that it is >999999 and <10000000

but what if i want the user to be able to enter number like 0000000, 0000125, 0123456.....

[Savage]

Then create function which will populate array of chars up to some limit,in this case it's seven,convert it to integer and return that number.So there won't be need for testing that number.(and also with this u can control that user inputs numbers only)

Savage

[Savage]

And if u don't know how to do it i'll be glad to help u on this one out while u are posting and asking in correspondance to posting guidelines.


PS:Sorry for double post


Savage

[weaknessforcats]

This won't do it:

Then create function which will populate array of chars up to some limit,in this case it's seven,convert it to integer and return that number.So there won't be need for testing that number.(and also with this u can control that user inputs numbers only)

You cannot control user input. The user can enter anything of any length in and any format but until the user presses enter, your C++ program isn't in control. When your program does receive control, the input buffer can contain anything.

[Savage]

This won't do it:


You cannot control user input. The user can enter anything of any length in and any format but until the user presses enter, your C++ program isn't in control. When your program does receive control, the input buffer can contain anything.

Yes we can:

1.Use getche.

2.If the char entered has value beetwen 48 and 57,inclusive put it in array of chars.

3.If enter is pressed or limit is crossed break out from loop and add '\0' char on the end.

4.return array.

5.Ta-dam.Done!

Savage

[metalinc]

Yes we can:

1.Use getche.

2.If the char entered has value beetwen 48 and 57,inclusive put it in array of chars.

3.If enter is pressed or limit is crossed break out from loop and add '\0' char on the end.

4.return array.

5.Ta-dam.Done!

Savage

hey savage,
can help me out here, i really have no idea how to do it...

[Savage]

hey savage,
can help me out here, i really have no idea how to do it...

Do u know how to populate arrays and how to operate with pointers?

Savage

[weaknessforcats]

This quote:

1.Use getche.

Won't be called until the user has pressed enter. When that happens the input buffer can contain anything.

If you really want this:

user to be able to enter number like 0000000, 0000125, 0123456.....

Then you are better off using cin.getline() and parsing the buffer received. At least this way if the user screwed up the entry format, you can ask for the entire line to be re-entered.

[Savage]

[quote=weaknessforcats]This quote:

Won't be called until the user has pressed enter. When that happens the input buffer can contain anything.
QUOTE]

Function getch() reads a single char from keyboard directly and return character readed from keyboard.

getche() is just immediately echoing on stdout.

so if we have next situation:
char c;
c=getch();

we will then be able to display that char on stdout.And becasue it's returning infact ASCII decimal value we can make up a if-else chain like:

//start loop
 
       c=getch();
       if(c>=48&&c<=57) put it in array of chars
       else if(c==13) break from loop
 
//end loop

Savage

[Banfa]

This quote:

Won't be called until the user has pressed enter. When that happens the input buffer can contain anything.

Function getch() reads a single char from keyboard directly and return character readed from keyboard.

This is true, it does however suffer from being a platform specific function so code using it will be non-portable.

However if that is acceptable then I would suggest using getch instead of getche. Then validate the character as a digit immediately and only if it is a digit output it to the screen and store it in your array.

[Savage]

This is true, it does however suffer from being a platform specific function so code using it will be non-portable.

However if that is acceptable then I would suggest using getch instead of getche. Then validate the character as a digit immediately and only if it is a digit output it to the screen and store it in your array.

Yes,and I was thinking of the getch,getche is typing error.

See my previous post

Savage