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    <p>I think you are asking how to validate multiple arguments: the command and the file.</p> <p>A simple strategy is to have function like the following:</p> <pre><code>#include &lt;fstream&gt; // Note: this is for ifstream below bool argumentsInvalid(const string&amp; command, const string &amp; command) { // Validate the command // Note: Not ideal, just being short for demo if("wc" != command &amp;&amp; "cc" != command &amp;&amp; "lc" != command) { std::cout &lt;&lt; "Invalid command" &lt;&lt; std::endl; return false; } // Validate the file // Note: This is a cheat that uses the fact that if its valid, its open. std::ifstream fileToRead(filename); if(!fileToRead) { std::cout &lt;&lt; "Invalid file: \"" &lt;&lt; filename &lt;&lt; "\"" &lt;&lt; std::endl; return false; } return true; // Note: This does rely on the ifstream destructor closing the file and would mean // opening the file twice. Simple to show here, but not ideal real code. } </code></pre> <p>If you want to evaluate ALL arguments before returning an error, insert a flag at the top of that function, like: </p> <pre><code>// To be set true if there is an error bool errorFound = false; </code></pre> <p>and change all of the returns in the conditions to:</p> <pre><code>errorFound = true; </code></pre> <p>and the final return to:</p> <pre><code>return !errorFound; </code></pre> <p>Usage:</p> <pre><code>.... if(argumentsInvalid(command, filename)) { std::cout &lt;&lt; "Could not perform command. Skipping..." &lt;&lt; std::endl; // exit or continue or whatever } // Now do your work </code></pre> <p>Note: The specific validity tests here are over simplified.</p>
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    1. POHow to input a file into C++ and comparing console input
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    1. USJonathan Seng
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