Clear trailing 0's on a double?

问题:

I have a double thats got a value of something like 0.50000 but I just want 0.5 - Is there any way to get rid of those trailing 0's? :)

回答1:

standard c format statements.

NSLog(@" %.2f", .5000)

回答2:

In C,

printf("%g", 0.5000);

Note: (from GNU libc manual)

The %g and %G conversions print the argument in the style of %e or %E (respectively) if the exponent would be less than -4 or greater than or equal to the precision; otherwise they use the ‘%f’ style. A precision of 0, is taken as 1. Trailing zeros are removed from the fractional portion of the result and a decimal-point character appears only if it is followed by a digit.