Adding double in groovy -

i defined 2 doubles:

double abc1 = 0.0001; double abc2 = 0.0001; 

now if print them:

println "abc1 "+abc1; println "abc2 "+abc2; 

it returns:

abc1 1.0e-4  abc2 1.0e-4 

while if add them:

println "abc3 "+abc1+abc2; 

it returns:

abc3 1.0e-41.0e-4 

rather than:

abc3 2.0e-4 

why happen?

the reason method didn't work addition operations goes left right. can instead this:

println "answer "+(double)(abc1+abc2);