Trying to get the program to read Lowercase letters as well

[jpxp]

Hello Fellow programmers i am new at this and i'm having trouble with this program. I want it to read lowercase and uppercase letters but for some odd reason it is not working.



#include <iostream>
using namespace std;

char getGrade()
{

char grade = 'Q'; //the default value
while (true)
{

cout << "what is your grade ? [ A,B,C,D,F, or Q to qit]:";
cin >> grade;
cin.ignore(1000,10);

if (grade == 'A' || grade == 'B' ||grade=='C' ) break;
if (grade == 'D' || grade == 'F' ) break;
if (grade == 'Q') break;

cout << grade << "is not vaild grade. Try again.." <<endl;

}//end while
return grade;
}//getGrade


int main ()
{
char grade;
while (true)
{
grade = getGrade();
if (grade == 'Q' || ) break;
if (grade == 'A' || grade == 'B' || grade == 'C' )
cout << "You pass" << endl;
}//while


cout << "Thanks for checking your grade!" << endl;
return 0;

}//main

[MrHutch]

How can the term grade == 'A' and grade == 'a' ever be evaluated to true if 'A' does not equal 'a'?

[Moschops]

if (grade == 'Q' || )

So, if grade is Q OR .... nothing? What's going on there?

[Piepenguin1995]

The simple way of doing it would be to just duplicate the code you used to check for the uppercase letters and change it to lowercase, like this:

if(grade == 'Q' || grade == 'q') break;
if(grade == 'A' || grade == 'a' || grade == 'B' || grade == 'b' || grade == 'C' || grade == 'c')
cout << "You pass" << endl;

Do the same when you read in the getGrade() function too.

It's not elegant, but it should work.

[MrHutch]

A simpler way would be converting the input to lower case and evaluating that, rather than checking for both cases.

[TwoOfDiamonds]

iHutch is right .
You can use this
grade = toupper (grade) ;

so if grade was a lowercase char it will become an uppercase . Anyway for this you will have to include <cctype> or <ctype.h>

You can learn more about this function here : http://www.cplusplus.com/reference/clibrary/cctype/toupper/

[SameerThigale]

Just adding an important point:

Use the 'code' option(from format) while posting, so that the code becomes more legible to read