how to make negative numbers into positive

Question

I am having the negative floating point number as:

a = -0.340515;

to convert this into positive number I used the abs() method as:

Answer 1

Well, in mathematics to convert a negative number to a positive number you just need to multiple the negative number by -1;

Then your solution could be like this:

a = a * -1;

or shorter:

a *= -1;