qt字符串转double（qt字符串转double精度）

科技前沿 • 2025-05-27 21:15 • 阅读 43

大家好，我是讯享网，很高兴认识大家。

 QString str1 = QString::number(10.663, ‘f’, 3);//返回一个相当于数字n的字符串，根据指定的格式和精度进行格式化。

讯享网

讯享网qDebug()&lt;&lt;tr(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">double转QString</span><span style="color: rgba(128, 0, 0, 1)">"</span>)&lt;&lt;<span style="color: rgba(0, 0, 0, 1)">str1; QString str2 </span>= QString::number(<span style="color: rgba(128, 0, 128, 1)">10.663</span>, <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">e</span><span style="color: rgba(128, 0, 0, 1)">'</span>, <span style="color: rgba(128, 0, 128, 1)">3</span>);<span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">'e', 'E', and 'f'小数点后保留3位</span> qDebug()&lt;&lt;tr(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">double转QString</span><span style="color: rgba(128, 0, 0, 1)">"</span>)&lt;&lt;<span style="color: rgba(0, 0, 0, 1)">str2; QString str3 </span>= QString::number(<span style="color: rgba(128, 0, 128, 1)">10.663</span>, <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">g</span><span style="color: rgba(128, 0, 0, 1)">'</span>, <span style="color: rgba(128, 0, 128, 1)">3</span>);<span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">'g' and 'G'保留3位有效数字</span> qDebug()&lt;&lt;tr(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">double转QString</span><span style="color: rgba(128, 0, 0, 1)">"</span>)&lt;&lt;str3;</pre>

qt字符串转double（qt字符串转double精度）

相关推荐