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    copied!<p>There are two issues you have to consider. The first is the precision parameter, which defaults to 6 (but which you can set to whatever you like). The second is what this parameter means, and that depends on the format option you are using: if you are using fixed or scientific format, then it means the number of digits after the decimal (which in turn has a different effect on what is usually meant by precision in the two formats); if you are using the default precision, however (<code>ss.setf( std::ios_base::fmtflags(), std::ios_base::formatfield )</code>, it means the number of <strong>digits</strong> in the output, regardless of whether the output was actually formatted using scientific or fixed notation. This explains why your display is <code>12.1231</code>, for example; you're using both the default precision and the default formattting.</p> <p>You might want to try the following with different values (and maybe different precisions):</p> <pre><code>std::cout.setf( std::ios_base::fmtflags(), std::ios_base::floatfield ); std::cout &lt;&lt; "default: " &lt;&lt; value[i] &lt;&lt; std::endl; std::cout.setf( std::ios_base::fixed, std::ios_base::floatfield ); std::cout &lt;&lt; "fixed: " &lt;&lt; value[i] &lt;&lt; std::endl; std::cout.setf( std::ios_base::scientific, std::ios_base::floatfield ); std::cout &lt;&lt; "scientific: " &lt;&lt; value[i] &lt;&lt; std::endl; </code></pre> <p>Seeing the actual output will probably be clearer than any detailed description:</p> <pre><code>default: 0.1 fixed: 0.100000 scientific: 1.000000e-01 </code></pre>
 

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