By using type conversion add 2 float numbers but the result must be integer

Answer 1

It would be great if you can tell us the language you want to know. To finally get an integer needs also some more information from you. What version you like to use:

4.49 -> 4 or 5
4.51 -> 4 or 5

Answer 2

Use round()

Answer 3

You are likely going to get one
Int
This 2.56 : 2 or 3
Else
10 .61 : 11 or 10

Answer 4

Tag language also in which you are looking..
In python,
int() cast to Integer result.

Ex:
s=int(4.0+5.0) =>s=9