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Mar 22nd, 2006

Validation Program

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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;

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Sun

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Mar 22nd, 2006

Re: Validation Program

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

WolfPack

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Mar 22nd, 2006

Re: Validation Program

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

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Mar 22nd, 2006

Re: Validation Program

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

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>}

WolfPack

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Mar 22nd, 2006

Re: Validation Program

>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?

iamthwee

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Mar 22nd, 2006

Re: Validation Program

>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>:

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";

Narue

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