How to not show unnecessary zeros when given integers but still have float answers when needed

NSString *str = [NSString
stringWithFormat:@"%g",12.10];

NSLog(@"str = %@",str);

输出：

str = 12.1

http://stackoverflow.com/questions/19667918/how-to-not-show-unnecessary-zeros-when-given-integers-but-still-have-float-answe

http://pubs.opengroup.org/onlinepubs/009695399/functions/printf.html

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