英文作业：对字符串进行处理 实现两个数正整数相加

java无忧网

Assignment #9

Goals:

Ø This lab gives students more experience in

· Top-down design.

· Procedural abstraction using methods.

· Good style programming.

Requirement

Write a structured program that can accept two integer numbers up to 40 digits and perform the followings:

1.        Add the two numbers and display the result.

2.        The result number should be separated by commas.
             For example

                          If inputs are:  

Number1:   236598745632

                             Number2:   2453254365546764765

The output should be:

                                                236,598,745,632 +

2,453,254,365,546,764,765

             -------------------------------------

2,453,254,602,145,510,397

       

Notes:

· You must read the two input numbers as string objects, then verify if the input is correct (i.e. all digit characters).

· You may assume that your program only works for positive integer numbers.

· You cannot use any of BigDecimal / BigInteger / double / long / int types for your calculations.

Marking Scheme

[2 marks] Presentation/Style: Organization, readability, descriptive  identifier,

                 indentation, bracket placement

[14 marks] Correctness: Program works without bugs. Appropriate use of

                  methods.

[4 marks] Internal Documentation and External document (Provide pseudo code
                for the method which adds the two String umbers)

运行效果：

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