Calculating students' average score

[amirshami]

hullo am sory but i have some thing trigaring my mind can you please help me out find the solution for this
1write a function
2write aprogram
"to readstudent's name ,examinationscore for 4 subjects ,compute their average score"
please help me out with that using c++
thanks AMIRSHAMI

[V.V.Raman]

hullo am sory but i have some thing trigaring my mind can you please help me out find the solution for this
1write a function
2write aprogram
"to readstudent's name ,examinationscore for 4 subjects ,compute their average score"
please help me out with that using c++
thanks AMIRSHAMI

Amirshami, I am sorry for my late response. Since you have not mentioned whether you want to read the information for all students or a student of your choice, I have included both the options.

#include "stdafx.h"

#include <string>
#include <fstream>
#include <iostream> 
#include <iomanip>
#include <sstream>

using namespace std;

void read_score(char* input_file)
{
	string student_name; 
	string line_string;
	double subject1; 
	double subject2; 
	double subject3; 
	double subject4; 
	double average;

	ifstream input_stream;
	input_stream.open(input_file);
    
	while (!input_stream.eof())
	{

		subject1 = 0.0; 
	    subject2 = 0.0; 
	    subject3 = 0.0; 
	    subject4 = 0.0; 
	    average = 0.0;

	    char line_chars[256];

		input_stream.getline(line_chars, 256, '\n');
		// Make sure that we are not looking at a line with no character
        if (strlen(line_chars) < 1)		
			continue;

		// We do not know whether the name and numbers are 
		// comma-seperated or not.  To be on the safer side, 
		// we will replace all commas with blank space.
		int i = 0;
		while (line_chars[i] != '\n' && line_chars[i] != '\0')
		{
			if (line_chars[i] == ',')
				line_chars[i] = ' ';
			i++;
		}
        
		line_string = string(line_chars);			

		int j = 0;
       
		// Remove the non-numeric parts from the line.
		// For that, first locate the index form which numbers begin.
        do
		{
			student_name = line_string.substr(0,j);
			j++;
		}while((line_string.c_str()[j] < '0' || 
			   line_string.c_str()[j] > '9'));

		// After locating the index, truncate the string object.
		line_string = line_string.substr(j);

        // We need to extract numbers from the stream.  For that
		// create a string stream using the remaining string object.
        stringstream stream;
		stream.str(line_string);		

		// Make sure that data is available in the line
        if (! stream.eof())
		    stream >> subject1; 
        if (! stream.eof())
		    stream >> subject2; 
        if (! stream.eof())
		    stream >> subject3; 
        if (! stream.eof())
		    stream >> subject4;
		
		cout << student_name << '\t';
		// Set output to be of one decimal
		cout << setprecision(3);
        cout << subject1 << '\t'
             << subject2 << '\t'
             << subject3 << '\t'
             << subject4 << '\t'
             << (subject1 + subject2 + subject3 + subject4)/4 << endl;
		stream.str("");


	}

	input_stream.close();

}
// Overloaded function to read information for a specific student
void read_score(char* input_file, char* name)
{
	string line_string;
	double subject1; 
	double subject2; 
	double subject3; 
	double subject4; 
	double average;

	ifstream input_stream;
	input_stream.open(input_file);
    
	while (!input_stream.eof())
	{

		subject1 = 0.0; 
	    subject2 = 0.0; 
	    subject3 = 0.0; 
	    subject4 = 0.0; 
	    average = 0.0;

	    char line_chars[256];

		input_stream.getline(line_chars, 256, '\n');
		// Make sure that we are not looking at a line with no character
        if (strlen(line_chars) < 1)		
			continue;

		// We do not know whether the name and numbers are 
		// comma-seperated or not.  To be on the safer side, 
		// we will replace all commas with blank space.
		int i = 0;
		while (line_chars[i] != '\n' && line_chars[i] != '\0')
		{
			if (line_chars[i] == ',')
				line_chars[i] = ' ';
			i++;
		}
        
		line_string = string(line_chars);			
		// Apply the filter for specific name
		if (line_string.find(name) < 0 ||
			line_string.find(name) > line_string.length())
			continue;

		int j = 0;
       
		// Remove the non-numeric parts from the line.
		// For that, first locate the index form which numbers begin.
        do
		{
			//student_name = line_string.substr(0,j);
			j++;
		}while((line_string.c_str()[j] < '0' || 
			   line_string.c_str()[j] > '9'));

		// After locating the index, truncate the string object.
		line_string = line_string.substr(j);

        // We need to extract numbers from the stream.  For that
		// create a string stream using the remaining string object.
        stringstream stream;
		stream.str(line_string);		

		// Make sure that data is available in the line
        if (! stream.eof())
		    stream >> subject1; 
        if (! stream.eof())
		    stream >> subject2; 
        if (! stream.eof())
		    stream >> subject3; 
        if (! stream.eof())
		    stream >> subject4;
		
		cout << name << '\t';
		// Set output to be of one decimal
		cout << setprecision(3);
        cout << subject1 << '\t'
             << subject2 << '\t'
             << subject3 << '\t'
             << subject4 << '\t'
             << (subject1 + subject2 + subject3 + subject4)/4 << endl;
		stream.str("");


	}

	input_stream.close();

}

int main(int argc, char* argv[])
{
	switch (argc)
	{
       case 2:
           // Get scores for all students
	       read_score(argv[1]);
		   break;

       case 0:
      // Never is this the case.  The executable  itself is an argument.
	   case 1:
		   return -1;

	   default:
       // Both file name and student name are given
           read_score(argv[1], argv[2]);
		   break;
	}


	return 0;
}