C Tutorial/ctype.h/isupper

isupper

Item Value Header file ctype.h Declaration int isupper(int ch); Return returns nonzero if ch is an uppercase letter; otherwise zero is returned.

<source lang="cpp">#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;
 }</source>