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:

a = abs(a); 

the result is a = 0.000000;

But I need the result as 0.340515.

Can anyone tell me how to do this.

Answer 1

abs() is for integers only. For floating point, use fabs() (or one of the fabs() line with the correct precision for whatever a actually is)

Answer 2

You have to use:

abs() for int
fabs() for double
fabsf() for float

Above function will also work but you can also try something like this.

    if(a<0)     {          a=-a;     }