Divide by zero and no error? [duplicate]

You are going to have DivideByZeroException only in case of integer values:

int total = 3;
int numberOf = 0;

var tot = total / numberOf; // DivideByZeroException thrown 

If at least one argument is a floating point value (double in the question) you’ll have FloatingPointType.PositiveInfinity as a result (double.PositiveInfinity in the context) and no exception

double total = 3.0;
int numberOf = 0;

var tot = total / numberOf; // tot is double, tot == double.PositiveInfinity