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    <p>I'm not sure what code you are actually running, because the <code>char filter = " "</code> line has no terminator and that assignment is definitely illegal. You cannot assign the string literal (a <code>char</code> array) to a single <code>char</code> variable.</p> <p>If you want to determine whether the nth character of a string is a tabulation, the following code would probably be what you are looking for:</p> <pre><code>if (line[counter] == '\t') { // match... } </code></pre> <hr> <p>As for updates. If typed as <code>string line = "1 90 74 84 48 76 76 80 85";</code> in your program, there are no tabulations in this string. There are only spaces. Moreover, <code>'\t\t'</code> is a pair of tables. Put a single <code>\t</code> in there for a single tab.</p> <p>Here is a slightly modified version of your sample function:</p> <pre><code>void getResults(string line) { int tmpSize = line.length(); int counter = 0; int tmpCounter = 0; while((tmpCounter &lt; tmpSize) &amp;&amp; (counter != MAX_No_Of_Grades)) { if(line[counter] == ' ') { counter++; } else { cout &lt;&lt; tmpCounter &lt;&lt; ". this is : " &lt;&lt; line[tmpCounter] &lt;&lt; "a" &lt;&lt; endl; tempGrade[counter] += line[tmpCounter]; } tmpCounter++; } } </code></pre> <p>This version has an extra check in the while loop to stop consuming characters after the end of <code>line</code> is reached. It also uses a space character since your test input does not use tabulations.</p> <hr> <p>If this is not homework and you can use all the standard library facilities you want, I would suggest looking into more advanced input strategies. Here is a simplified version of your function to extract every single number in the array.</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;sstream&gt; void getResults ( const std::string&amp; line ) { std::istringstream input(line); for (int grade=0; input &gt;&gt; grade;) { // process grade. } } </code></pre> <p>If you want to remove the global variable and handle any number of grades, you can use a <code>std::vector&lt;&gt;</code> to automatically increase the "array" size as you get more and more grades.</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;sstream&gt; #include &lt;vector&gt; std::vector&lt;int&gt; getResults ( const std::string&amp; line ) { std::istringstream input(line); std::vector&lt;int&gt; grades; for (int grade=0; input &gt;&gt; grade;) { grades.push_back(grade); } return grades; } </code></pre>
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    1. USAndré Caron
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