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Iscntrl

Item Value Header filectype.h Declarationint iscntrl(int ch); Returnreturns nonzero if ch is a control character or zero is returned. #include <ctype.h>   #include <stdio.h>   int main(void)   {     char ch;     for(;;) {        ch = getchar( );        if(ch == '.') {           break;        }        if(iscntrl(ch)){           printf("%c is a control char\n", ch);        }     }     return 0;   } 1 is a control char 2 is a control char 3 is a control char .