C Reference Upper case letter test: isupper()
The isupper() function returns a non-zero if its argument is an uppercase letter.
If the argument is not an uppercase letter, then zero is returned.
isupper() source code example:
#include<stdio.h>
#include<ctype.h>
int main()
{
char a;
scanf( "%c", &a );
if( isupper(a) )
printf( "This is an uppercase letter: %c\n", a );
else
printf( "This is NOT an uppercase letter: %c\n", a );
return 0;
}
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