if (rpnp[i].op == OP_NUMBER) {
rpnp[i].val = (double) rpnc[i].val;
} else if (rpnp[i].op == OP_VARIABLE || rpnp[i].op == OP_PREV_OTHER) {
if (rpnp[i].op == OP_NUMBER) {
rpnp[i].val = (double) rpnc[i].val;
} else if (rpnp[i].op == OP_VARIABLE || rpnp[i].op == OP_PREV_OTHER) {