[Qt-interest] string to float

[yanqzhi at gmail.com]

hi,

When a string converts to a float, the float returned does't exactly match the string;

 QString str("57.130");
 float a = str.toFloat();

the float is 57.130001.

　　　　　　　　 
　　　　　　　　yanqzhi at gmail.com 
　　　　　　　　　　2010-01-27 
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