DaniWeb Forum Index > Software Development > C++

C++ RSS

Validation Program

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Mar 2006

Posts: 2

Reputation: Sun is an unknown quantity at this point

Solved Threads: 0

Sun

Offline

Newbie Poster

Validation Program

Mar 22nd, 2006

How can i make a program in c++ which accept only the following:

1) Any positive number.
2)Character from [A to Z] -in upper case.

Note: this program won't work as desired because idon't know how to get the ASCII of any number or character-by using int().

#include<iostream.h>
void main()
{
int a;
cout<<"Enter either number or character to check it's availability "<<endl;

cin>>a;

if(int ('a')>=65 && int('a')<=90) // int('a') always will be 97-the ASCII of character a.
cout<<"It's valid"<<endl;

•

Join Date: Jun 2005

Posts: 1,496

Reputation: WolfPack has a spectacular aura about

Solved Threads: 104

WolfPack

Offline

Mentally Challenged Mod.

Re: Validation Program

Mar 22nd, 2006

Get the input as a char and then try validating it's ascii code.

•

Join Date: Mar 2006

Posts: 2

Reputation: Sun is an unknown quantity at this point

Solved Threads: 0

Sun

Offline

Newbie Poster

Re: Validation Program

Mar 22nd, 2006

In that way i will reserve abig string to sore any length for input because idon't know how to store characters in dynamic array at the first of program so in that way the program will take a useless space

•

Join Date: Jun 2005

Posts: 1,496

Reputation: WolfPack has a spectacular aura about

Solved Threads: 104

WolfPack

Offline

Mentally Challenged Mod.

Re: Validation Program

Mar 22nd, 2006

Giving you the solution is easier than trying to understand what you are saying.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
using namespace std;
int main()
{<blockquote>char a;
cout<<"Enter either number or character to check it's availability "<<endl;
cin>>a;
if( (  'a' <= a && a <= 'z' ) ||( 'A' <= a && a <= 'Z' )|| ( '0' <= a && a <= '9' ) )
{<blockquote>cout<<"It's valid"<<endl;</blockquote>}
return 0;</blockquote>}
#include<iostream>
using namespace std;
int main()
{<blockquote>char a;
cout<<"Enter either number or character to check it's availability "<<endl;
cin>>a;
if( (  'a' <= a && a <= 'z' ) ||( 'A' <= a && a <= 'Z' )|| ( '0' <= a && a <= '9' ) )
{<blockquote>cout<<"It's valid"<<endl;</blockquote>}
return 0;</blockquote>}

•

Join Date: Aug 2005

Posts: 5,266

Reputation: iamthwee is a splendid one to behold

Solved Threads: 377

iamthwee

Offline

Posting Expert

Re: Validation Program

Mar 22nd, 2006

>Giving you the solution is easier than trying to understand what you are saying.

I second that! Sometimes I have no idea what they mean?

*Voted best profile in the world*

•

Join Date: Sep 2004

Posts: 7,771

Reputation: Narue has a reputation beyond repute

Solved Threads: 743

Narue

Offline

Code Goddess

Re: Validation Program

Mar 22nd, 2006

>idon't know how to get the ASCII of any number or character
char is a little int, so you don't need to do anything special to get the numeric value of the character (ASCII isn't always used). However, since ASCII isn't always used, and not all character sets are required to have contiguous values for anything but the numeric digit characters, you're much better off using isalpha and isdigit from <cctype>:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
if ( std::isdigit ( c ) || std::isalpha ( c ) )
  std::cout<<"Valid";
if ( std::isdigit ( c ) || std::isalpha ( c ) )
  std::cout<<"Valid";