本文介绍了C ++ Handle -0.0 from Database的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
目前我正在研究一些C ++代码，我需要从数据库中读取数据，如果数据库值非零，那么我需要应用一些其他逻辑。
但是在数据库中有一些正在计算的值，可以得出-0.0。而这个负零被视为C ++双变量中的垃圾值。我已经在构造函数中将值初始化为0.0。
At present I am working on piece of C++ code in which I need to read data from a database, and if database value is non-zero, then I need to apply some further logic.
But in the database there are values which are being calculated and can come out as -0.0. And this negative zero is being treated as Garbage value in C++ double variable. I have already initialized the value as 0.0 in constructor.
// This list is being populated from Database
for (Sample::List<BalanceSheet>::Iterator i((Sample::List<BalanceSheet> &) Balance.Entries()); i.HaveItem(); ++i)
{
if (SomeCondition != "")
{
// This is where am getting Garbage values since GetBalance() returns -0.0
if (i->GetBalance() != 0)
{
DoOperation();
}
}
}推荐答案
if (i->GetBalance() != 0) // This is a bug waiting to happen请在此处阅读： []
Read here: https://isocpp.org/wiki/faq/newbie#floating-point-arith[^]
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