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copied!<blockquote> <p>error C2601: 'X' : local function definitions are illegal</p> </blockquote> <p>It sounds like you're defining a function inside another function; C++ doesn't allow you to do that. Move the definition of <code>X</code> outside the function it's currently in.</p> <p>Another possibility is that there's another function immediately before <code>X</code>, and you missed out the <code>}</code> at the end of that function.</p> <blockquote> <p>The problem is that matrix_entry, temp and M are undeclared identifier But in my main I have this:</p> </blockquote> <p>Firstly, types need to be declared before they're used. It sounds like this function appears either before the definition of <code>matrix_entry</code>, or in a different source file.</p> <p>Either move the definition of <code>matrix_entry</code> to a point before anything needs to use it, or put it in a header and include that from each source file that needs it. That will fix the first two "undeclared identifier" errors for <code>matrix_entry</code> and <code>temp</code>.</p> <p>If <code>M</code> is in <code>main</code>, then it's not available in other functions. You could pass it to the function(s) that need it:</p> <pre><code>void Mode(matrix_entry * M){ matrix_entry temp; temp=M[i]; M[i]=M[small_i]; M[small_i]=temp; } int main() { matrix_entry *M = new matrix_entry [10]; //... Mode(M); //... // Don't forget to delete anything you new // (Better still don't new it in the first place, // or use smart pointers if you must) delete [] M; } </code></pre>

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