[New Term] C++ Math Functions: round() (#1043)

* New Entry: C++ Math Functions: `round()` (#986)

* fix: removed unwanted fun `round()` from `main` (#986)

* New Entry: C++ Math Functions: `round()` (#986)

* fix: sentences rephrased (#986)

* ⚡ fix: update example and sentences rephrased (#986)

* ⚡ refactor: cpp math-function `round()` (#986)

* ⚡ refactor: cpp math-function `round()` (#986)

* ⚡ refactor: cpp math-function `round()` (#986)

* fix: changes and reword sentences

* 🚀 fix: compile time error

* 🚀 fix: single line to `list` comment

* Update round.md

content/cpp/concepts/math-functions/terms/round/round.md

@@ -0,0 +1,72 @@
+---
+Title: 'round()'
+Description: 'Returns the integer that is nearest to the argument, with halfway cases rounded away from the ending zero.'
+Subjects:
+  - 'Computer Science'
+Tags:
+  - 'Functions'
+  - 'Arithmetic'
+  - 'Methods'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+The **`round()`** function returns the integer that is closest to the argument, with halfway cases rounded away from the ending zero.
+
+## Syntax
+
+```pseudo
+round(num);
+```
+
+- The `num` parameter must be a `double`,`float`, or `long double`.
+- The return value will be an integer.
+- If the decimal in `num` is `0.5` or higher, the closest integer greater than `num` is returned.
+
+## Example
+
+The following example showcases the `round()` function being applied to two `double` values, one of which is a halfway case:
+
+```cpp
+#include <iostream>
+#include <cmath>
+
+int main() {
+  double num1 = 9.23;
+  double result1;
+  result1 = std::round(num1);
+
+  std::cout << "The result of round(9.23) is " << result1 << "\n";
+
+  double num2 = 4.5;
+  double result2;
+  result2 = std::round(num2);
+
+  std::cout << "The result of round(4.5) is " << result2 << "\n";
+}
+```
+
+This produces the following output:
+
+```shell
+The result of round(9.23) is 9
+The result of round(4.5) is 5
+```
+
+## Codebyte Example
+
+The following example is runnable and rounds the halfway case away from zero:
+
+```codebyte/cpp
+#include <iostream>
+#include <cmath>
+
+int main() {
+  double num = 10.89;
+  double result;
+  result = std::round(num);
+
+  std::cout << "The result is " << result << "\n";
+}
+```