assignment6-1-2-grade.cpp

this code is code c++. have many lesson

#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdlib>
using namespace std;
int main()
{
    int n;
    ifstream fin("data.txt");
    ofstream fout("grade.txt");
    fout << "Score & Grade" << endl;
    fout << "-------------" << endl;
    fout << "Score\tGrade" << endl;
    while(fin>>n){
                  fout << n << "\t";
                 
                  if(n >= 85 && n <= 100)
                  {
                       fout << " A" << endl;
                  }
                  else if(n >= 70 && n <= 84)
                  {
                       fout << " B" << endl;
                  }
                  else if(n >= 60 && n <= 69)
                  {
                       fout << " C" << endl;
                  }
                  else if(n >= 50 && n <= 59)
                  {
                       fout << " D" << endl;
                  }
                  else
                  {
                      fout << " F" << endl;
                  }
                  }
    fout.close();
    
    system("PAUSE");
    return 0;
}