Problem with Checking Value

[gregarion]

Hey guys. I am trying to write a program which will read data from a text file and then check if the data contains only numerals or not.

My text file is basically in this format...

12
34
red

Basically, the expected output of my program is that it will check the data and then tell me if the data is in numbers only or not. For this example, the output should be

yes!
yes!
no

Here is my coding

cpp file

int CheckType:: CheckNumeral(string& num)

 {

     int a;
     int b;
   for (int i = 0; i < num.length(); i++) {
       if (!isdigit(num[i]))
           return 1;
   }
    
   return 3;

   
}

main

int main()
{
    fstream readFile("Note.txt");
string templine ;
string line ;
    CheckType ct ;

while (getline(readFile,templine))
{
    if (templine != " "){
ct.CheckNumeral(templine);
 if (ct.CheckNumeral(templine)== 3){
       cout<<"yes!"<<endl;
  }else if(ct.CheckNumeral(templine)== 1){
       cout<<"no"<<endl;
    }
  else{
      cout << "do not know"<< endl;
  }
    }
     else
    {
        cout << "i am done" << endl;
    }

Header file

using namespace std ;

class CheckType
{
public :
    int CheckNumeral (string& ) ;
private :

};

Using the prog i wrote , the output i get when i run the example text will be...

no
no
no

Can sombody help me to identify the problem and tell me what might be the problem? hope for some help. Thanks

[tabstop]

I would suggest doing something like

std::cout << "|" << templine << "|";

in your code to see if you have (say) spaces at the end of your lines that are getting picked up by readline.

[rocketman50]

I've pieced together your code (didn't bother using a header file) and it seems to work fine for me?

#include<iostream>
#include <fstream>
#include <string>
using namespace std;

class CheckType
{
public :
    int CheckNumeral (string& ) ;
private :

};

int CheckType:: CheckNumeral(string& num)
 {
   for (int i = 0; i < num.length(); i++) {
       if (!isdigit(num[i]))
           return 1;
   }
   return 3;
}

int main()
{
fstream readFile("Note.txt");
string templine ;
string line ;
CheckType ct ;

while (getline(readFile,templine))
{
	if (templine != " "){
		ct.CheckNumeral(templine);
			if (ct.CheckNumeral(templine)== 3){
				cout<<"yes!"<<endl;
		   }
		   else if(ct.CheckNumeral(templine)== 1){
				cout<<"no"<<endl;
			}
		   else{
			   cout << "do not know"<< endl;
			}
    }
    else
         cout << "i am done" << endl;
}

}

gives output :

yes!
yes!
no

[gregarion]

Really? you managed to run it and get the correct output? i tried running it on another computer and used the codes u pasted. yet i still get the same error. anybody know other ways to check for numerals?