Using cin to input array values

Question

I am trying to take a variable use it for a size declarator into an array. I am having trouble getting the data into the array. What will happen then is that I will divide the array into an average and return a char value. The only problem I have is with inputting data into the array. Thanks in advance here is the code.

#include <iostream>

using namespace std;

int average(int&);

char grade(int);

int main()
{
    int array = {};
    int numgrades;
    int total = 0;

    cout << "Enter the number of grades" << endl;
    cin >> numgrades;

    for (int i = 0; i < numgrades; i++) {
        cout << "Enter a numeric grade between 0 - 100" << endl;
        cin >> i;
        total += i;

    }

    int average = total / numgrades;


    char result = grade(average);


    cout << "The grade is " << result << "." << endl;

    return 0;
}

char grade(int avg)
{
    if (avg >= 90) {
        return 'A';
    }
    else if (avg >= 80 && avg < 90) {
        return 'B';
    }
    else if (avg >= 70 && avg < 80) {
        return 'C';
    }
    else if (avg >= 60 && avg < 70) {
        return 'D';
    }
    else
    {
        return 'F';
    }

}

You don't have an array... Consider reviewing how to declare and use an array. Also, think about what the variable i is and what cin >> i; does. — user9254539
– user9254539, Commented Jun 24, 2018 at 2:41

ykaner · Accepted Answer · 2018-06-24 03:14:54Z

3

You have some critical problems in your code, this is what will do the work:

cin >> numgrades;

int *array = new int[numgrades] ;

for (int i = 0; i < numgrades; i++) {
    cout << "Enter a numeric grade between 0 - 100" << endl;
    cin >> array[i];
    total += array[i];

}

The important parts are creating the array dynamically, using the new statement and passing the wished size. Also your problem was in overriding i by the cin >> i line, instead you need to save the value to the array at i, like this cin >> array[i].

For more ways work with dynamic data and arrays in C++ I recommend you read about std::vector.

answered Jun 24, 2018 at 3:14

ykaner

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