Question

Write a C++ program that computes a student’s grade for an assignment as a percentage given the student’s score and the total points. The final score should be rounded up to the nearest whole value using the ceil function in the <math> header file. You should also display the floating-point result up to 5 decimal places. The input to the program must come from a file containing a single line with the score and total separated by a space.

If you can, explain in depth the process behind this code. I want to learn this. It also does not have to be fancy operations, it can be hard coded. Thank you.

Answer 1

Hi, Please find my implementation.

Please let me know in case of any issue.

#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int main(){

   string infile;
   cout<<"Enter the name of input file: ";
   cin>>infile;

   // opening input file
   ifstream readScoreStrem(infile.c_str());

   if(readScoreStrem.fail()){
       cout<<"ERROR in opening input file"<<endl;
       return -1;
   }

   double student_total = 0; // to store total student score
   double total_all = 0; // to store sum of all total

   double score, total; // to read curren line from file

   while(readScoreStrem>>score>>total){ // reading score and total from current line
       student_total = student_total + score;
       total_all = total_all + total;
   }

   //closing file
   readScoreStrem.close();

   // calculating percentage
   double percentage = (student_total/total_all)*100;

   int final_score = ceil(student_total);

   cout<<"Final Rounded Score: "<<final_score<<endl;
   cout<<"Percentage: "<<percentage<<endl;

   return 0;
}

########## scores.txt ##########

56 100
45.5 50
89 100
67.5 80

fourthweek fourthweek g++ studentscorepercent.cpp → fourthweek ./a . out Enter the name of input file: scores.txt Final Rounded Score: 258 Percentage: 78.1818 fourthweek