定义和使用分数类fraction：

1.自定义分数类fraction，使用该类可以完成分数的输入、分数的加、减、乘、除二目运算和一目减运算、分数的约分操作、分数的倒数运算、对两个分数进

行六种比较运算、以及对分数的输出等操作。

2.尽量用运算符重载函数。如，可重载+、-、*、/、>、>=、<、<=、==、!=，以实现分数的各种运算。并且实现分数与整数的混合运算。

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Class definition and use of scores fraction:

1 Custom score class fraction, the use of such input can be completed scores, scores of add, subtract, multiply and divide two operations and a project by project operations, scores some points operation, scores of reciprocal operation of the two scores into the

Line six kinds of comparison operators, as well as scores of output and other operations.

(2) the best use of operator overloading function. For example, scores can be overloaded+,-,*,/,>,>=,<,<=,==,!=, to achieve a variety of operations. And to achieve a mixture fraction and integer operations.