C/ctype.h/isupper
int isupper(int ch)
//Declaration: int isupper(int ch);
//Return: returns nonzero if ch is an uppercase letter;
otherwise zero is returned.
#include <ctype.h>
#include <stdio.h>
int main(void)
{
char ch;
for(;;) {
ch = getchar();
if(ch == "."){
break;
}
if(isupper(ch)){
printf("%c is uppercase\n", ch);
}
}
return 0;
}
/*
d
s
a
w
C
C is uppercase
.
*/