Compare Two Files

[sinmaplewing]

Task Description

Write a program to compare two files. Your program must compare two files A and B in a line by line or a byte-by-byte manner according to the first command line option. A ‘-byte’ option tells your program to compare two file byte by byte in binary mode, and a ‘-line’ option tells your program to compare two file line by line in text mode. The names of A and B are given as the second and the third command line option.

The constraints on the parameters are as follow.

• The length of a line in text mode is no more than 256

Note that C has short circuit evaluation. That is, if there is an expression A && B, and we evaluate A to be true, we will then evaluate B. However, if we evaluate A to be false, we will NOT evaluate B since the answer is definitively false. The implication is that if you use A && B as a condition to for continuing the reading process of reading two files, you must realize that if A fails B will not be executed.

Input

All input are given as command line options.

Output

We need to output where these two files are different.

• If the comparison is byte by byte, the output will be a sequence of lines, each has the format “Bytes %d differ”, where %d is the offset of the byte in the file, starting from 0. If the files are of different length, then we need to output "File %s has %d bytes remaining", where %s is the name of the longer file and %d is the number of bytes that were not compared.
• If the comparison is line by line, the output will be a sequence of lines, each has the format "Lines %d differ", where %d is the sequence number the line in the file, starting from 0. If the files have different number of lines, then we need to output "File %s has %d lines remaining", where %s is the name of the longer file and %d is the number of lines that were not compared.

  Sample Execution

a.exe -line file1 file2

Sample output

Lines 1 differ File file2 has 1 lines remaining

Test Data

You can download the test data (which JudgeGirl uses) from here.

[tzuhsien]

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[exe1023]

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