Question

In C++

1. Test Scores #1

Write a program that dynamically allocates a built-in array large enough to hold a user-defined number of test scores. (Ask the user how many grades will be entered and use a dynamic array to store the numbers.) Once all the scores are entered, the array should be passed to a function that calculates the average score. The program should display the scores and average. Use pointer notation rather than array notation whenever possible. (Input Validation: Do not accept negative numbers for test scores.) Make it a class, call it something like gradeholder. You will need a destructor because you are using dynamic arrays.

Answer 1

Solution

Code

#include <iostream>
#include <iomanip>

using namespace std;

double calculateAverageScore(double *, int);

int main()
{
  
int numGrades;
//userinput
cout << "Enter number of test scores: ";
cin >> numGrades;

//dynamic allocation
double *testScores = new double[numGrades];

for(int i = 0; i < numGrades; i++){
cout << "Score " << i + 1 << ": ";

cin >> *(testScores + i);

//checking user input for negative number
while(*(testScores + i) < 0){
  
cout << "You entered negative number"<<endl;
cout << "Please enter the number again"<<endl;
cin >> *(testScores + i);
}
}

  
cout << fixed << setprecision(1);

cout << endl;
cout << "TestScores: \n";
for(int i = 0; i < numGrades; i++){
cout << *(testScores + i) << " ";
}

cout << "\n\nAverage of " << numGrades << " tests is: ";
cout << calculateAverageScore(testScores, numGrades);
  
delete[] testScores;
testScores=0;

return 0;
}

double calculateAverageScore(double *ptr, int size){

double sum = 0.0;

for(int i = 0; i < size; i++){
sum += *(ptr + i);
}

return (double)sum/size;
}

Screenshot

OUtput

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all the best