isalpha function in C

The function isalpha() returns non-zero if its argument is a letter of the alphabet. Otherwise it shall return 0 or False.
Header File - #include<ctype.h>, cctype(c++)
Syntex - isalpha(int ch)

isalpha function Example1

#include<stdio.h> #include<conio.h> #include<ctype.h> void main () {   char chr[]="abc123";   int j=0;   while (isalpha(chr[j]))   {          j++;          printf ("The %d character are alphabet.\n",j);   }   getch(); }                          Output