C isupper Function: Checking Uppercase Characters

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C isupper Function: Checking Uppercase Characters

mishramanishd

I need to verify if a character is uppercase in my C program. I read that the isupper in c function can help, but I'm unclear on its behavior.

What header file do I need to use isupper?
Does isupper return a boolean value?
Will it work on numbers or special characters?
I wrote this quick test:

c
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includefv

include

int main() {
char ch = 'G';if (isupper(ch)) { printf("Uppercase