在小数部分尾数加0将被废弃.

Trailing zeroes in the decimal portion are discarded.

教师揭示：小数部分的位数是有限的小数，叫做有限小数。

Teacher : if the decimal place is finite , the decimal is called a finite decimal.

整数与小数部分可一次性进行转换。

Integer part and decimal part can be once conversed in this method.

如何更改打印结果小数部分的有效位数？

How to modify the decimal when printing the results?

编辑浮点值时，由于要将小数部分从十进制转换为二进制，因此所得的结果可能存在微小误差。

Editing floating-point values can result in minor inaccuracies because of decimal-to-binary conversion of fractional components.

把数分成整数和小数部分，然后分别转换各部分，便可将十进制数转换成基数计数制下对应的数。

Conversion from decimal to its equivalent representation in the radix r system is carried out by separating the number into its integer and fraction parts and converting each part separately.

如果将不足一天的时间间隔转换为小数部分，则可能会发生精度损失。

Converting time intervals of less than a day to a fraction can involve a loss of precision.

如果将不足一分钟的时间间隔转换为小数部分，则可能会发生精度损失。

Converting time intervals of less than a minute to a fraction can involve a loss of precision.

这回我们搞个有趣的，把秒定义为double型，以便记录秒的小数部分。

Just to keep things interesting, let's make secondadouble, so we can record fractions of a second.