Just to point out something odd about this line in the OP code: 
$result = `$bin > output.txt`;

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The backticks around the command-line string tell perl to capture whatever output is produced on the command's stdout, but since the command includes a redirection of stdout to a file, there will be nothing available for perl to assign to your "$result" variable -- it will get an empty string, because all the stdout content from "hello.txt" is written (via redirection) to the "output.txt" file.

I get the impression that this isn't what you intended. If you want $result to store the (numeric) exit status of the command, use system; if you want it to get the stdout content from the command, remove the  > output.txt part from the command line string.

In reply to Re: Running a C program from Perl by graff
in thread Running a C program from Perl by n4nature

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