need help with c++ program in UNIX environment

You are to download/build/install a very specific version of the program gawk. Then, using your just installed gawk, you are to write a simple gawk program that will calculate and output the sum of some specific columns in a table that is maintained in a file. Finally, you are to create a C++ program that calls your specific gawk to perform its work. Your C++ program must capture the results of the work (the column sums) and display that info. Then, it must add up all the Colum sums and provide a total sum. You must use a Makefile to compile your program.

- You are to write a gawk program that will parse a file that contains 6 columns of numbers. The gawk program should sum up column 1 and column 4 and return both numbers on a single line (just 2 integers and nothing else). Your gawk program should be stored in a file named gawk.code and the table of numbers should be stored in a file called numbers.txt. You create your own numbers table. See the

Example numbers.txt file and the example gawk output below.

From the shell, you may call gawk with this command (using the gawk you compiled): /gawk f gawk.code numbers.txt

See the man page for gawk to get the details of the f flag (and more)

- You are to write a C++ program that will call your gawk program and collect/display the results of the gawk output. The first call to gawk should pass in the version option. You should print out the results to screen and it should display version 3.1.8. The second call to gawk should call the program stored in gawk.code that operates on the number.txt file. This call will return the 2 integers representing the column sums. From within your C++ program, you are to collect the results of the call and print these integer values to the standard ouput. You are then to add the two numbers together and print out the sum of the two numbers to standard output.

o You will need to use the popen/pclose functions to perform your shell call to gawk and to gather the results back into your C++ program. This is a C interface in Unix so make sure you realize you are not working with C++ objects. See man 3 popen for details (the 3 means section three of the manual).

o For getting numbers out of C-style strings (the results of the gawk command), you might want to use the C++ stringstream type. You will need to google how to do this