Idiomatic D code to avoid or detect devision by zero

[Martin Tschierschke]

What would be the idiomatic way to write a floating point division
occuring inside a loop and handle the case of division by zero.

c = a/b; // b might be zero sometimes, than set c to an other 
value (d).

(In the moment I check the divisor being zero or not, with an 
if-than-else structure,
but I find it ugly and so I ask here.)