convert number to letter of alphabet?

[TurboMetrologist]

Hi,

Is there a LabWindows function for converting a number to an alphabet equivalent?

I was trying something like this...

char getLetterOfAlphabetByNum(int number){
    //test if alpha
    if(isalpha (number)==0)
        DebugPrintf ("Error converting number to letter. Non-alphabetic.");
    else{
        //take decimal and convert to ascii
        statusReturned=Fmt (&letter, "%s<%d", number);
        if(statusReturned<0)
            DebugPrintf ("Error converting number to letter!\n");
        DebugPrintf ("tempString = %s\n", letter);
    }
    DebugPrintf ("%d --> %s\n",number,letter);
return letter;
}

Thanks!

[RobertoBozzolo]

Supposing you want to obtain the ASCII character corresponding to a given int number, you could use

sprintf (string, "%c", number);

You will need to validate the input number to be <= 255, next to see if the character is printable (which not necessarily means it's alphabetic: you must consider numbers, punctuation and other printable characters like ([{*@# and so on: isprintf and isgraph functions can be of help)

[TurboMetrologist · Accepted solution]

Thanks, this was my solution. Passing a 4 gives a 'D', for example.

//number of alphabet to letter
char getLetterOfAlphabetByNum(int number){
    number=number+64;
    //test if alpha and printable
    if(isgraph(number)==0){
        DebugPrintf ("Non-printable character.\n");
        return;
    }
    if(isalpha(number)==0){              
        DebugPrintf ("Non-alphabetic.\n");
        return;
    }
    sprintf (&tempString[0], "%c", number);
    letter=tempString[0];
    DebugPrintf ("%d --> %c\n",number,letter);
return letter;
}

[RobertoBozzolo]

It seems to me that you could simplify your code this way:

//number of alphabet to letter
char getLetterOfAlphabetByNum (int number)
{
    number += 64;
    //test if alpha
    if (!isalpha (number)) {              
        DebugPrintf ("Non-alphabetic.\n");
        return 0;
    }
    return (char)number;
}

I excluded the test for printable characters as is it overcome by test for alphabetic.

Also, be warned that passing numbers from 33 to 58 returns lowercase letters.

[TurboMetrologist]

Thanks Roberto

[CVI-User]

You can do this, too:

number += 'A';