Arrays from text file?

Here is example input.txt:

1
2
3
4
5
6
7
100  100
100  100
90   100
100  100
80   100
100  100
100  100


I would like to find the sum of the first column and divide it by the sum of the second column.
First column is score and second column is total possible per assignment.
For a program that calculates overall course grade and will take infinite input.
set sum_of_scores and sum_of_possibles to 0

while you can input a score and a possible ...
   ... add these to their sums

output sum_of_scores divided by sum_of_possibles



Away you go!
Schools are generally terrible at showing basic C++ I/O file streams, so here's something you can work with:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
#include <iostream>
#include <fstream>

int main()
{
    std::ifstream fin("input.txt");
    
    // ... TODO ...

    // while "successfully reading in the next actual score and possible score"
    while (fin >> actual_score >> possible_score)
    {
        sum_actual_scores += actual_score;
        sum_possible_scores += possible_score;
    }
    
    // ... TODO ...
}


You should be able to do the rest.
Last edited on
iIf there is to be truly infinite input then just a single line will do:
std::cout << “Please wait while processing continues\n”;
Thank you, I ended up using an Excel sheet.
First column is score and second column is total possible per assignment.
I would like to find the sum of the first column and divide it by the sum of the second column.

If you're trying to compute the average grade, your math may be wrong. The way you're computing it, each point of each assignment is worth the same amount, so a quiz with 20 points is worth twice as much as a quiz with 10 points. If you want each assignment to count the same as each other assignment, then you need to adjust your math.
Registered users can post here. Sign in or register to post.