記錄個還沒分析的現象:
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100.0);
此時val 爲46
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100);
或
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100.0f);
val纔是47
記錄個還沒分析的現象:
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100.0);
此時val 爲46
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100);
或
NSNumber *num = @0.47;
int val= (int)([num floatValue ]*100.0f);
val纔是47