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Isalpha

Item Value Header filectype.h Declarationint isalpha(int ch); Returnreturns nonzero if ch is a letter or zero if not. #include <ctype.h>   #include <stdio.h>   int main(void)   {     char ch;     for(;;) {        ch = getchar();        if(ch == '.') {           break;        }        if(isalpha(ch)) {           printf("%c is a letter\n", ch);        }     }     return 0;   } a a is a letter a a is a letter d d is a letter .