C++循環小數的処理

問題描述：
　　Write a program that will accept a fraction of the form N/D, where N is the numerator and D is the denominator and print the decimal representation. If the decimal representation has a repeating sequence of digits, indicate the sequence by enclosing it in brackets. For example, 1/3 = .33333333...is denoted as 0.(3), and 41/333 = 0.123123123...is denoted as 0.(123). Use xxx.0 to denote an integer. Typical conversions are:
　　1/3 = 0.(3) //將循環部分用( )擴起來。
　　22/5 = 4.4
　　1/7 = 0.(142857)
　　2/2 = 1.0
　　3/8 = 0.375
　　45/56 = 0.803(571428)
　　Input ：
　　A single line with two space separated integers,N and D,1