Why does the division of two integers return 0.0 in Java? [duplicate]

Answer 1

If you are using int values, using a double may be a better choice and have less rounding error. float can represent int values without error up to ~16 million. double can accurately represent all int values.

double percentage =(double) totalOptCount / totalRespCount;

Percentages are usually multiplied by 100, meaning you can drop the cast.

double percentage = 100.0 * totalOptCount / totalRespCount;