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C isupper()



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isupper()

The isupper() function returns nonzero if ch is an uppercase letter; otherwise zero is returned.

isupper() Syntax

Following is the syntax of the isupper() function :

#include<ctype.h>
int isupper(int ch);

isupper() Example

Following program checks each character read from stdin and reports all uppercase letters :

#include<ctype.h>
#include<stdio.h>
#include<conio.h>
void main()
{
	clrscr();
	char ch;
	for(; ;)
	{
		ch = getchar();
		if(ch == '.')
			break;
		if(isupper(ch))
			printf("%c is uppercase\n", ch);
	}
	getch();
}

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