C++ significant figures

c++ math rounding significant-digits
joshim5 picture joshim5 · Jan 5, 2011 · Viewed 36.5k times · Source

How can I do math involving significant figures in C++? I want this to work correct with measured data from chemistry and physics experiments. An example: 65 / 5 = 10. I would need to get rid of unneeded decimal places and replace some digits with 0s.

Thanks!

Answer

Rion Williams picture Rion Williams · Jan 5, 2011

This should get you what you need:

std::cout.precision(x); // x would be the number of significant figures to output

Related questions

What is the C++ function to raise a number to a power?

How do I raise a number to a power? 2^1 2^2 2^3 etc...

Read More
Is there a standard sign function (signum, sgn) in C/C++?

I want a function that returns -1 for negative numbers and +1 for positive numbers. http://en.wikipedia.org/wiki/Sign_function It's easy enough to write my own, but it seems like something that ought to be in a standard …

Read More
Fast ceiling of an integer division in C / C++

Given integer values x and y, C and C++ both return as the quotient q = x/y the floor of the floating point equivalent. I'm interested in a method of returning the ceiling instead. For example, ceil(10/5)=2 and ceil(11/5)=3. The …

Read More