Lower case-upper case

[prateekbothra28]

Please help me to write a program to convert lowercase string to uppercase string
Please!!

[TheIdeasMan]

http://www.ascii-code.com/

a char is just a small int, so you can take advantage of this to do the conversion.

Chars can used in two ways, these are equivalent:

char MyChar = 'a'
MyChar = 97;

You can do math on them:

char MyChar = 'a'
char NewChar = MyChar + 3; //NewChar is 'd' 

Hope all goes well.

[IceThatJaw]

http://www.cplusplus.com/reference/clibrary/cctype/toupper/

[TheIdeasMan]

I was thinking that it is an assignment.

[Catfish2]

TIM's solution is the quick and dirty way, which won't work if the computer is from a different planet and doesn't use ASCII encoding.

If it's an assignment, do some real work to show interest.

switch (letter)
{
    case 'a': return 'A';
    case 'b': return 'B';
    // ...
    default: return letter;
}

[TheIdeasMan]

@Catfish2

Your solution is very good & portable as well - the only downside is the verbosity.

As you alluded to, I am wondering how many computers there are that don't use ASCII? Mainframes, VAX machines etc. I would have thought the vast majority of computers for personal use, use ASCII, so the solution I hinted at would be fine for most people.

The code for the toupper function as described by Kernighan & Ritchie, uses math on the char value, and it also has code to deal with EBCDIC.