Task 3: Rounding
Task
Implement the following rounding function that rounds a 64-bit floating point number (type `double`) to the nearest 32-bit integer (type `int`). You may assume that the type `double` complies with the IEEE standard 754. The function is only required to work correctly if the nearest integer is in the value range of the type `int`, otherwise, the return value of the function is undefined.
Note: Usage of library rounding functions (standard or others) is not allowed.
// PRE: x is roundable to a number in the value range of type @int@
// POST: return value is the integer nearest to x, or the one further
// away from 0 if x lies right in between two integers.
int round_number(double x);Write your solution in `rounding.h`.
Hint: In `C++`, when you convert a `float` or `double` to an `int`, the fractional part gets cut off (truncated). Think about how you can use the truncated number to solve the exercise.
Solution
#pragma once
// PRE: x is roundable to a number in the value range of type int
// POST: return value is the integer nearest to x, or the one further
// away from 0 if x lies right in between two integers.
int round_number(double x) {
int res;
if (x < 0)
res = x - 0.5;
else
res = x + 0.5;
return res;
}Made by JirR02 in Switzerland 🇨🇭