Programming: programming a simple calculator four operations: from the keyboard to enter a four operator expression (no spaces and brackets), the event of an equal sign " =" the instructions to enter the end of output. Calculator can only assume that addition and subtraction multiplication and division operations, the operands and the results are integers, four kinds of operator precedence the same as calculated according to the order from left to right (ie: 2+3* 5 first, a 2+3, and then calculate 5* 5). Example: Figures in bracket shows

java\Test.java
....\Test.java.bak
....\Test.class
....\Test1.java
....\Test1.java.bak
....\Test1.class
....\Point.java
....\Point.class
....\Point.java.bak
....\Test2.java
....\Test2.java.bak
....\Person.java
....\Person.java.bak
....\Person.class
....\Test3.java
....\Test3.java.bak
....\Test3.class
....\test.jar
....\Student.java
....\Student.java.bak
....\Test_extends.java
....\Person1.java
....\Test_extends.java.bak
....\Student1.java
....\Test_extends.class
....\Student1.class
....\Person1.class
....\Person1.java.bak
....\Student1.java.bak
....\SuperClass.java
....\testTeacher\TestTeacher.java
....\...........\TestTeacher.java.bak
....\...........\Person.java
....\...........\Teacher.java
....\...........\Person.java.bak
....\...........\Person.class
....\...........\Teacher.java.bak
....\...........\Teacher.class
....\...........\TestTeacher.class
....\...........\TestDog.java
....\...........\Dog.java
....\...........\TestDog.class
....\...........\Dog.class
....\...........\Dog.java.bak
....\...........\TestDog.java.bak
....\...........\Animal.java
....\...........\Cat.java
....\...........\TestCat.java
....\...........\Cat.java.bak
....\...........\TestCat.class
....\...........\Animal.class
....\...........\Cat.class
....\...........\TestCat.java.bak
....\...........\Test_Cat.java
....\...........\Test_Cat.java.bak
....\...........\Test_Cat.class
....\TestTeacher.java
....\person\Person.java
....\......\Father.java
....\......\Mother.java
....\......\Father.java.bak
....\......\Mather.java.bak
....\......\Person.java.bak
....\......\Parent.java
....\......\Parent.java.bak
....\......\TestPoly.java
....\......\Mother.java.bak
....\......\TestPoly.java.bak
....\......\TestPoly.class
....\......\Father.class
....\......\Person.class
....\......\Mother.class
....\......\Parent.class
....\......\Test_in.java
....\......\Test_face.java
....\......\Test_in.java.bak
....\......\Valueable.java
....\......\Valueable.java.bak
....\......\Test_face.class
....\......\Valueable.class
....\......\Test_in.class
....\......\Test_face.java.bak
....\Test_ex.java
....\Test_ex.class
....\Test_ex.java.bak
....\TestArray.java
....\TestArray.java.bak
....\TestArray.class
....\TestArgs.java
....\TestArgs.java.bak
....\TestArgs.class
....\array\Test_Array .java
....\.....\Test_Array .java.bak
....\.....\TArray.java
....\.....\TArray.java.bak
....\.....\TArray.class
....\.....\TestCount .java.bak
....\.....\TestCount1 .java
....\.....\TestCount.java
....\.....\TestCount.class

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