cncheckc
c = cncheckc();
c = cncheckc();
c = cncheckc();
if (cncheckc() != -1)
c = cncheckc();
c = cncheckc();
c = cncheckc();
while ((c = cncheckc()) == -1)
c = cncheckc();
while (cncheckc() == -1)
if (cncheckc() != -1)
c = cncheckc();
c = cncheckc();
int cncheckc(void);