Why is output wrong when i keep brackets in summing 1/i

Question

https://code.sololearn.com/cSp0rD0goxNE/?ref=app

Answer 1

Change to 1 to 1.0
sum+=(1. 0/i);

Answer 2

Try to use a float value (1.0f) instead of 1 (it's an integer) at line 11.

sum += (float)(1.0f / i);