How can I make a memory diagram for a c++code?

Question

I had never made a memory diagram before can anyone help me? Please its urgent!

//Given is a c++ Program to search a name of student from a file.
//I have more task Please help me in this one only!

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main()
{
string line;
char name_of_student[1000];
int offset;
ifstream Myfile;
Myfile.open("Names of Students.txt");
cout << "Enter the name to search from the respective file : \n";
cin.getline(name_of_student , 1000);
if (Myfile.is_open())
{
while (!Myfile.eof())
{
getline(Myfile,line);
if ((offset = line.find(name_of_student, 0)) != string::npos)
{
system("CLS");
cout << "\n\n\t\t Congratulations!\n\tThe name " << name_of_student << " have been found!\n\n\n\n";
break;
}
}
}
Myfile.close();
}