C++ Write a program that calculates the total grade for N classroom exercises as

Question

C++

Write a program that calculates the total grade for N classroom exercises as a percentage. I need to use the Decimal Format class to output the value as a percent. The user should input the value for N followed by each of the N scores and totals. Calculate the overall percentage (sum of the total points earned divided by the total points possible) and output it as a percentage. Sample output:

How many exercises to input? 3

Score received for exercise 1:  10
Total points possible for exercise 1:  10

Score received for exercise 2:  7
Total points possible for exercise 2:  12

Score received for exercise 3:  5
Total points possible for exercise 3:  8

Your total is 22 out of 30, or 73.33%.

Explanation / Answer

NOTE: I have used iomanip header file for formatting decimal places.

Code:

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main()
{
int i, n, st_total, act_total;
int score[100], total[100];
double per;

cout << "Enter how many exercises to input? ";
cin >> n;
for(i = 0; i < n; i++){
      cout << "Score received for exercise "<< i << ": ";
      cin >> score[i];
      cout << "Total points possible for exercise "<< i << ": ";
      cin >> total[i];
      cout << endl;
}
for(i = 0; i < n; i++){
      st_total += score[i];
      act_total += total[i];
}

per = (float(st_total) / act_total) * 100;

cout << "Your total is "<< st_total << " out of " << act_total << ", or "<< setprecision(4) << per << "%";

return 0;
}

Execution and output:
Enter how many exercises to input? 3
Score received for exercise 0: 10
Total points possible for exercise 0: 10

Score received for exercise 1: 7
Total points possible for exercise 1: 12

Score received for exercise 2: 5
Total points possible for exercise 2: 8

Your total is 22 out of 30, or 73.33%

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