Which dataType will return the value (37.961498) as it is ? Double didn't work

问题

Which dataType will return the value (37.961498) as it is?

I am working in MapView. Where, at present I am setting annotation and hence I have to set CLLocationCoordinate2DMake with some lat and lng parsed from googleAPI (Eg:lat = "37.9615000" and lng = "60.5566000") . I have the values in string, hence I converted the sting to double and then assigned But it didn't help. Please some one help me.

   double int1=[num1s floatValue];
    double int2=[num2s floatValue];
   NSLog(@" %f %f ",int1,int2);
    annotation.coordinate=CLLocationCoordinate2DMake(int1, int2);

actual values are: 37.9615000,60.5566000 Values I get in NSLog: 37.961498, 60.556599

Thanks in advance.

More explanation and reason why I need exact value:

I need to set annotation for china With its lat and lan ( lat = "53.5609740"; lng = "134.7728099")

But while converting again from string the value changes

回答1:

When converting a string to a double you should be using doubleValue instead of floatValue

double int1=[num1s doubleValue];
double int2=[num2s doubleValue];
NSLog(@" %f %f ",int1,int2);
annotation.coordinate=CLLocationCoordinate2DMake(int1, int2);

also not critical but I wouldn't recommend naming your doubles as int1 and int2 that is likely to cause you confusion at some point

回答2:

annotation.coordinate=CLLocationCoordinate2DMake([nums doubleValue], [int2 doubleValue]);

Try this

回答3:

double int1=[num1s floatValue];
double int2=[num2s floatValue];
NSLog(@" %0.7f %0.7f ",int1,int2);
annotation.coordinate=CLLocationCoordinate2DMake(int1, int2);

Read String Format Specifiers for more info.

来源：https://stackoverflow.com/questions/19656315/which-datatype-will-return-the-value-37-961498-as-it-is-double-didnt-work