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POReading parts of an input file
 

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    <p>I would like to read an input file in C++, for which the structure (or lack of) would be something like a series of lines with <em>text = number</em>, such as</p> <pre><code>input1 = 10 input2 = 4 set1 = 1.2 set2 = 1.e3 </code></pre> <p>I want to get the number out of the line, and throw the rest away. Numbers can be either integers or doubles, but I know when they are one or other.</p> <p>I also would like to read it such as</p> <pre><code>input1 = 10 input2=4 set1 =1.2 set2= 1.e3 </code></pre> <p>so as to be more robust to the user. I think this means that it shouldn't be red in a formatted fashion.</p> <p>Anyway, is there a smart way to do that?</p> <p>I have already tried the following, but with minimal knowledge of what I've been doing, so the result was as expected... no success.</p> <pre><code> #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;float.h&gt; #include &lt;math.h&gt; #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;iomanip&gt; #include &lt;cstdlib&gt; #include &lt;boost/lexical_cast.hpp&gt; #include &lt;string&gt; using namespace std; using namespace boost; int main(){ string tmp; char temp[100]; int i,j,k; ifstream InFile("input.dat"); //strtol InFile.getline(temp,100); k=strtol(temp,0,10); cout &lt;&lt; k &lt;&lt; endl; //lexical_cast InFile.getline(temp,100); j = lexical_cast&lt;int&gt;(temp); cout &lt;&lt; j &lt;&lt; endl; //Direct read InFile &gt;&gt; tmp &gt;&gt; i; cout &lt;&lt; i &lt;&lt; endl; return 0; } </code></pre>
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