Need Help for this problem Uppercase.

[ezered]

Create a program that converts all to uppercase and all to lowercase.

Enter a String: GOOD BOY

[JosAH]

What have you done until now and what part of your code made you seek help on this forum?

kind regards,

Jos

[PhHein]

What I'd use is a combination of Character.toLowerCase(ch), Character.toUpperCase(ch), char[] and StringBuilder.

[rdtindsm]

In case you can't simply use the library functions, you can use a mask to change case, since the off set between upper and lower is a power of two. 0x20 is the correct mask. Use "AND" or "OR" and "negation" as needed. This is assuming the ascii english character set. But that's why it's best to use library functions. Upper case starts at 0x41, lower case at 0x61, IIRC.

[JosAH]

In case you can't simply use the library functions, you can use a mask to change case, since the off set between upper and lower is a power of two. 0x20 is the correct mask. Use "AND" or "OR" and "negation" as needed. This is assuming the ascii english character set. But that's why it's best to use library functions. Upper case starts at 0x41, lower case at 0x61, IIRC.

No need to fiddle with all those magic numbers; the Character class has all you want.

kind regards,

Jos

[rdtindsm]

The post started out with what was basically an if statement with a clear conditional. Not trying to suggest that it be done differently from using java classes unless that was was the point of the exercise, which was unspecified. I really tried to make that clear.

At worst, the information might be useful background in other settings. I've had to write these functions in other languages.