C/C++ reference: http://www.cppreference.com/

Reference for file I/O

Laboratory 3: Command Line Arguments and File Parsing

        In this lab, you will learn how to get arguments from the command line.
        You will also learn how to parse a file (i.e. read and process the contents of a file).

• Topics to be explained by your TA.
• Command line arguments
• argc
• argv[]
• How to run a program at the DOS prompt
• Different ways of reading a file
• character-by-character (using get()  or  >>)
• line-by-line ( using getline() )
• length-wise ( using get() )
• reading up to a delimiter (getline() or get() )
• Checking the state of a file-stream ( using eof(), good(), bad(), fail() )

 

YOUR TASK

• Download ParseArguments.cpp and try it with different command line arguments.
• Example: prog_name -o file1.txt -i file2.txt

 

Program for parsing an input file:

• Create a C++ program “fileparser” that reads through a file, and outputs the parts between parentheses ‘(‘ and ‘)’.
• Your program should use command line arguments to get the name of the input file.
• The program will be executed at DOS prompt as

            fileparser.exe  <input_file>

• Create a project called “fileparser” containing the following files:
• “lab3.cpp”    : The main program ( complete this by adding your code )
• “parser.h”     : This defines the class Parser ( download this file )
• “parser.cpp” : The cpp file for the Parser ( write this on your own )
• The program should do the following:
• Get the name of the input-file from the command line.
• Open and read the file, printing only the strings between ‘(‘ and ‘)’.
• Use the getstr() method to read each such string and the printstr() method to output the string.
• Implement the methods getstr() and printstr() of the class “Parser”
• Use the following input files to test your code:
• test.txt
• jabberwock.txt

 

SOLUTION

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Lab3Sol.zip