C/ctype.h/islower

int islower(int ch)

<source lang="cpp">

//Declaration: int islower(int ch); //Return: returns nonzero if ch is a lowercase letter;

               otherwise zero is returned. 

 #include <ctype.h>
 #include <stdio.h>
 int main(void)
 {
   char ch;
   for(;;) {
     ch = getchar();
     if(ch == "."){
        break;
     }
     if(islower(ch)){
        printf("%c is lowercase\n", ch);
     }
   }
   return 0;
 }
        

/* 1 2 b b is lowercase f f is lowercase r r is lowercase e e is lowercase d d is lowercase A .

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      </source>