case '=': // equal
push(new AssignmentOperator(variableTypeId, valueTypeId,
fCounter));
break;
case '+': // plus equal
push(new PlusAssignmentOperator(variableTypeId, valueTypeId,
fCounter));
break;
case '-': // minus equal
push(new MinusAssignmentOperator(variableTypeId, valueTypeId,
fCounter));