c++: How to run a program taking string and filenames as arguments?

Question

I've to run a program sample sample-code.cpp. It is taking a string like -create, 2 file names: one as input input.txt and one as output filename output.idxas parameters and one integer 10.

I should be able to run it from command line (mac Terminal/UNIX) using:

$sample-code -create input.txt output.txt 10

This is a snippet of main() code:

int main(int argc, char* argv[])
{

    // Creating New File
    if (strcmp(argv[1],"-create") == 0)
    {
        KeyFieldMax = atoi(argv[2]);
        InputFileName = argv[3];
        IndexFileName = argv[4];

when I type this command $sample-code -create input.txt output.txt 10 I get this error :

-bash: sample-code: command not found.

What exactly is the question or problem? What you have should work, though it looks like it's expecting the integer before the filenames. — samanime
– samanime, Commented Nov 14, 2016 at 22:17
KeyFieldMax = atoi(argv[2]); did you miss that in the command lin arguments? — πάντα ῥεῖ
– πάντα ῥεῖ, Commented Nov 14, 2016 at 22:18
What about using getopt or something like it? Argument parsing is surprisingly tricky. — tadman
– tadman, Commented Nov 14, 2016 at 22:18
when I type this command $sample-code -create input.txt output.txt 10 I get this error : -bash: sample-code: command not found. Maybe the program is not compiled. — Amit-dat
– Amit-dat, Commented Nov 14, 2016 at 22:26
@Dungeoun Suspected you are in the directory the sample-code was build to, just type ./sample-code. — πάντα ῥεῖ
– πάντα ῥεῖ, Commented Nov 14, 2016 at 22:32

Cinder Biscuits · Accepted Answer · 2016-11-14 22:56:24Z

1

bash: sample-code: command not found is telling you that sample-code is not in bash's command path. if you're in the directory you build the program in, type ./sample-code to run it.

Your error Segmentation fault: 11 is an out of bounds array. You need to run a sanity check on the arguments to verify they are actually there before calling their position in the array:

if (argc < 4)
{
    fprintf(stderr, "Urk! Not enough arguments!");
    return 1;
}
else
{
    KeyFieldMax = atoi(argv[2]);
    InputFileName = argv[3];
    IndexFileName = argv[4];
    ...

answered Nov 14, 2016 at 22:56

Cinder Biscuits

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1 Comment

Amit-dat Over a year ago

I checked it. My order of inputs was wrong and I was missing some arguments.

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