Added the solution of problem 6.

Author: aditya-agr

C++/6_digit_sum.cpp

@@ -0,0 +1,14 @@
+//Given 2 numbers N and M. Print thesum of lastdigit of both the numbers.
+
+#include <iostream>                    //iostream is a header file which contains basic input/output functions.
+using namespace std;
+int main() {
+    long long int N, M;                 //Declaring variables N and M as double.
+    int sum;
+    cin >> N >> M;                      //Taking input of N and M.
+    sum = N%10 + M%10;                  //Taking the sum of last digit(i.e. remainder of division by 10)
+    cout<<sum<<endl; 
+    return 0;                           //Return 0 to indicate that the program ended successfully.
+    //End of program
+}
+