Exericse 4.1

#include<iostream>using namespace std;int main(){    const int ArSize = 20;    char firstname[ArSize];    char lastname[ArSize];    char mark;    int age;    cout << "What is your first name?";    cin.getline(firstname,ArSize);    cout << "What is your last name?";    cin.getline(lastname,ArSize);    cout << "What letter grade do you deserve?";    cin >> mark;    cout << "What is your age?";    cin >> age;    cout << "Name:" << lastname << ", " << firstname << endl;    mark++;    cout << "Grade: " << mark << endl;    cout << "Age: " << age << endl;    return 0;}