put $ in reg IRA is to defer tax 'til you withdraw the $ put $ in Roth doesn't offer any benefit now but future earnings (if any) is tax free at withdrawal. 各有好處
开始时为什么用objC,应该是和历史有关的问题。 http://lowendmac.com/orchard/05/next-computer-history.html Work on NeXTstep pressed on through 1986 and 1987. It was relatively easy for the developers to port Mach and BSD to the new hardware platform, but it proved more difficult for the group to create the new servers that would differentiate NeXTstep from its competition. Objective-C and Display PostScript were the two most ambitious project. In order to have an object oriented operating system, an object oriented pr
如果有耐心,可以继续参看: http://c2.com/cgi/wiki?NextStep ObjectiveC was created by BradCox, and ProductivityProductsInternational ( PPI) was the name of the company under which it was first marketed. PPI was later renamed to "StepStone". The VultureCapitalists? who invested in PPI forced PPI to adopt the brilliant strategy of going head-to-head against AT& T (ObjectiveC versus C++). BradCox and the other cofounders tried very hard to persuade their investors and customers to view ObjectiveC as a "module- l
【在 r****y 的大作中提到】 : 如果有耐心,可以继续参看: : http://c2.com/cgi/wiki?NextStep : ObjectiveC was created by BradCox, and ProductivityProductsInternational ( : PPI) was the name of the company under which it was first marketed. PPI was : later renamed to "StepStone". The VultureCapitalists? who invested in PPI : forced PPI to adopt the brilliant strategy of going head-to-head against AT& : T (ObjectiveC versus C++). BradCox and the other cofounders tried very hard : to persuade their investors and customers to view ObjectiveC as a "module- : l
r*y
21 楼
Objective C 比C++ flexible,又比一般的script语言solid. 适合做复杂又有灵活 性的应用。 C++ 虽然很坚固,但语法太繁琐,动态特性还不及Java,当然比较适合Mission critical的应用。 script随然灵活,但没有坚固的支撑,难以独立做大程序。 Objective C 正好刚柔相济。 尤其,新版本加入Block后,处理相互纠缠的逻辑关系更是如鱼得水。