How do I run this command line argument?

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I'm trying to create a 2D grid for the following command line argument, but I can't seem to figure out how to run it within a Putty terminal:

C++

if (argc!=2){
        cerr << "No maze size entered." <<endl;
        return -1;
    }

    if ((n = atoi(argv[1]))==0 || n<4){
        cerr << "Incorrect maze size entered." <<endl;
        return -1;
    }

After compiling my file should it be somthing like ./a.out 5...? Any help would be appreciated.

What I have tried:

I tried running main after compiling with:

a.out 5 5 :"No map size entered"
./a.out 5 : Memory leak, program loops
./a.out 5 5:"No map size entered"

Posted 22-May-16 10:25am

Member 12539276

Updated 23-May-16 11:48am

Albert Holguin

v2

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Sergey Alexandrovich Kryukov 22-May-16 16:51pm

What do you mean by "running an argument"? A command-line argument is the part of the string followed by the name of your program file name when you start it. Did you know that? Is it your program? If it yours, you should know better what do you expect for command line, how you handle it and how you process invalid command-line input.
—SA

Richard MacCutchan 23-May-16 3:26am

Why are the error messages on the console different from the ones in your code?

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Jochen Arndt · Answer 1 · 2016-05-22T22:20:00

a.out 5 5 :"No map size entered"

This is quite clear (beside that the message text differs from the one printed by your code as already mentioned by Richard). Your code checks if exactly one argument has been passed and terminates when argc is not 2.

With the above commands argc is 3 and argv[0] = "a.out", argv[1] = "5", and argv[2] is "5".

So you may rewritre your check to give more detailed messages:

if (argc < 2)
{
    cerr << "No maze size entered." <<endl;
    return -1;
}
else if (argc > 2)
{
    cerr << "Too many arguments." <<endl;
    return -1;
}

./a.out 5 : Memory leak, program loops

You did not show the code that generates this message. At least the tests shown in your question has been passed.

CPallini · Answer 2 · 2016-05-22T22:38:00

Solution 2

./a.out 5 : Memory leak, program loops

This is the correct command line, so it succesfully pass your checks. However your program fails in the later Steps (you didn't post such code).

Posted 22-May-16 22:38pm

CPallini