耳顺之年主要是形容人到了六十岁的年龄,在孔子的《论语·为政》中出现过,原文是“吾十有五,而志于学。三十而立,四十而不惑,五十而知天命,六十而耳顺,七十而从心所欲。”意思是到了六十这个年纪,是听得进逆耳
Before .Net, before math coprocessors, before IEEE-574, Microsoft defined a bit pattern for floating-point numbers. Old versions of the C++ compiler happily used that definition.