isdigitch
if (isdigitch(*lhside)) {
if (isdigitch(*rhside))
} else if (isdigitch(*rhside)) {
if (isdigitch(*lhside))
if (isdigitch(*rhside))
if ((*numstr == '-') && (isdigitch(*(numstr + 1)))) {
if (!isdigitch(*cf_numstr))
for (cp = cf_numstr; (cp < cf_numstr + 5) && isdigitch(*cp); cp++)
if (isdigitch(*q))
if (!isdigitch(*string++))