实现方法
QString str;
double val = 3.14159;
str = QString::number(val,'f',2);//方法1
str = str.setNum(val,'f',2);//方法2
str = QString::asprintf("%.2f",val);//方法3
str = str.sprintf("%.2f",val);//方法4
实现方法 QString str; double val = 3.14159; str = QString:: […]
QString str;
double val = 3.14159;
str = QString::number(val,'f',2);//方法1
str = str.setNum(val,'f',2);//方法2
str = QString::asprintf("%.2f",val);//方法3
str = str.sprintf("%.2f",val);//方法4
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