ios - float value from [NSString floatValue] show different result when print out -

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Please refer to the code below and view in the results console. 

  NSString * strRatio = @ "0.03"; Float F = [stratio float value]; NSLog (@ "% F,% @", F, F = 0.03? @ "Equal": @ "not equal");   
 Result:  
  0.030000, not equal   
 In addition to this I have a screenshot when I  NSLog (@ "% f,% @", f, f == 0.03? @ "Par": @ "not equal"); , it is showing me  f  0.0299999993 ...  
 Can anyone explain it?  
     
  1.  Why is the result of  f = 0.03  false?  
  2.  Why F is 0.030000 but it shows 0.0299999993 when debug occurs.   
     enter image details here  
     edited Do:  
     I hope the value of f is 0.03 after converting from "0.03", how can I get it?  
     It seems that float 0.03 is represented by Even if I assign 0.03 to the float value, then I will get 0.029999993 as a result.   
     
     
     Value is not  0.03 , as is D As shown in the second -  0.0299999993 .  
     It shows in the log as  0.03000  default, % f  5 Displays the decimal place, so the value is being rounded on  0.0299999993  to  0.03000 .  
     Change the log % .10f  And you'll see the actual value.

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