Thread: how to print only relevant parts of doubles' decimal places

I have a set of doubles. I don't want to print the extra zeroes at the end, just the relevant part. Problem is, each double has a different fractional part. Take a look at some code below:

Code:

double x, y, z;
x = 1.2;
y = 1.45;
z = 7;

printf("x is %f, y is %f, and z is %f", x, y, z);

The output of that program will be something like:
x is 1.200000000, y is 1.45000000000, and z is 7.000000000000

I would like it to print "x is 1.2, y is 1.45, and z is 7"
Anyone have any ideas?

EDIT: Thanks, matsp, for pointing out about x. I changed that.

Actually, x is uninitialized in your example.

But it's a non-trivial problem to solve. You could write a function to find out how large the fraction is in each case, but there's no generic way to do that.

--
Mats

Code:

printf("x is %g, y is %g, and z is %g", x, y, z);