fmt.Sprintf rounds float numbers

<p>Is this supposed to work like that ? I was expecting to have 0.010.</p> <pre><code>a := 0.010510757102972574 b := fmt.Sprintf(&#34;%.3f&#34;, a) fmt.Println(b) // 0.011 </code></pre> <p><a href="https://play.golang.org/p/BYpbVQeRyC" rel="nofollow">https://play.golang.org/p/BYpbVQeRyC</a></p> <hr/>**评论：**<br/><br/>lstokeworth: <pre><p>Yes. The <a href="https://godoc.org/strconv#FormatFloat" rel="nofollow">documentation</a> for the underlying format function says:</p> <blockquote> <p>FormatFloat converts the floating-point number f to a string, according to the format fmt and precision prec. It rounds the result assuming that the original was obtained from a floating-point value of bitSize bits (32 for float32, 64 for float64).</p> </blockquote></pre>prvst: <pre><p>thanks</p></pre>