qstring保留小数点后2位

要在QString中保留小数点后2位，可以使用QString::number(double n, char format = 'f', int precision = 2)函数。这个函数会将double类型的数字n转换为字符串，并指定格式为'f'，精度为2。例如：

double num = 3.14159;
QString str = QString::number(num, 'f', 2);

这将得到字符串"3.14"，保留了小数点后2位。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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