chore(CPlusPlus): add even odd algorithm (#876)

* Added Check-Even-Odd Algo

* Spell-Check Failed error fixed

Co-authored-by: en1gm479 <spydergup@gmail.com>

algorithms/CPlusPlus/Maths/Check-Even_Odd.cpp

@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+//Function to check whether a number is Odd or not.
+//We use a single Odd function to check for Even-Odd, If it return true then it is Odd else it is Even.
+bool isOddBin(int num){
+    //We compare the last bit of the number to decide for Even or Odd
+    //If the last bit of the num is set (i.e. 1) then number is odd and its "Binary And (&)" with the 1 will return true(1).
+    //Similarly in case of even num last bit is unset/off (i.e. 0) and its "Binary And (&)" with the 1 will return false(0).
+    return (num&1);
+} 
+
+bool isOddN(int num){
+    //In this we use the Mod(%) operator to check for Even-Odd.
+    //If the num is Odd then (num%2) will give 1 and function will return true. 
+    //If the num is Even then (num%2) will give 0 and function will return false. 
+    return (num%2==1);
+}
+
+int main() {
+    int num;
+    cin >> num; //Taking input from the user
+    string result;
+    result = isOddBin(num) ? "Odd" : "Even"; //Evaluating string based on result from isOdd function
+    cout << result<<endl; //Printing result
+    result = isOddN(num) ? "Odd" : "Even"; //Evaluating string based on result from isOdd function
+    cout << result; //Printing result
+    //Ex : num = 11 , result will print "Odd"
+    //Ex : num = 8 , result will print "Even"
+    //Time Complexity :O(1)
+    //Space Complexity :O(1)
+    return 0;
+}