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    <p>There are several problems. As has already been mentionned, you return from the middle of the nested loop: certainly not what you want to do. Also, before the loop, you read into matrix[lines][cols]: this is undefined behavior, since you've never initialized lines and cols. (Typically, you wouldn't even define them until in the for, e.g.: for ( int lines = 0; lines &lt; 30; ++ lines ) for ( int cols = 0; cols &lt; 30; ++ cols ) .) Still, the line is syntactically valid, and reads the first non-blank char from the input (in your case, the initial #). And writes it somewhere, although it's anybody's guess where.</p> <p>Some additional comments: -- The argument to readfile should be char const*, and not char*. Or even std::string const&amp;.</p> <p>-- I'm not sure what you're trying to read into the matrix: where do the 30 come from in its definition? And shouldn't it be "int matrix[x][x]", or something along those lines. Or more likely: "std::vector >".</p> <p>-- You're reading integers (or as written, a single char); precision has no effect. It also has no effect on input.</p> <p>-- And what is "ifs.setf(ios::fixed, ios::showpoint)" supposed to do. (As it happens, it almost certainly sets the floating point format to its default---and not to fixed---, although I think the behavior is formally undefined.) Not that it matters; these flags also have no effect on input.</p> <p>-- The "while(!ifs.eof())" is also certainly wrong. The expression ifs.eof() is only reliable <em>after</em> an input operation has failed.</p> <p>In addition, you'll need some special handling for the first non-comment line, and some special handling for the first character in each line.</p> <p>-- James Kanze</p>
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