Thread: input validation, kinda

Hey there,

i have this following code i'd like some feedback from if possible(comments, critism, tips)

I'm a newb with C++ and currently trying to grasp the concepts of OOP

two files, main.cpp and a header file:

source file:

Code:

/* 
 * File:   main.cpp
 * Author: joe
 *
 * Created on September 15, 2008, 4:44 PM
 */

#include "scoreLib.h"

int main()
{
    float input;
    

    std::cout << "Please enter a score: ";
    if(std::cin >> input)
    {
        Score student(input);
        student.gradeResult();
        std::cout << "Your Score is: " << input << std::endl;
    }
    else
    {
        std::cout << "Please enter a numeric value" << std::endl;
    }
    
return 0;
}

header file:

Code:

/* 
 * File:   scoreLib.h
 * Author: joe
 *
 * Created on September 15, 2008, 4:44 PM
 */

#include <iostream>
#ifndef _SCORELIB_H
#define	_SCORELIB_H

class Score
{
    
    float *numGrade;

    public:

    Score(float);
    ~Score();
    
    void gradeResult(){
        if((*numGrade >= 95) && (*numGrade <= 100))
        {
            std::cout << "Merit!\n";
        }
        else if((*numGrade >= 80) && (*numGrade <= 94))
        {
            std::cout << "Pass!\n";
        }
        else if((*numGrade >= 65) && (*numGrade <=79))
        {
            std::cout << "Partial Resit\n";
        }
        else if((*numGrade >= 50) && (*numGrade <= 64))
        {
            std::cout << "Full Resit\n";
        }
        else if((*numGrade >= 0) && (*numGrade <= 49))
        {
            std::cout << "Fail!\n";
        }
        else
        {
            std::cout << "Sorry enter a number between 1 and 100\n";
        }
    }
};

Score::Score(float defaultScore)
{
    numGrade = new float;
    *numGrade = defaultScore;
}

Score::~Score()
{
    delete numGrade;
}

#endif	/* _SCORELIB_H */

I'm currently trying to fix this bug where by if you entered say for instance 3e3, it will still exectute:

Code:

std::cout << "Your Score is: " << input << std::endl;

which it shouldnt, but am having some difficulty trying to figure out why it does this, help MUCH appreciated, thanks in advance