Question

write a c++ program that prompts a user to enter 10 numbers. this program should read the numbers into an array and find the smallest number in the list, the largest numbers in the list the sum of the two numbers and the average of the 10 numbers

PS use file I/o and input error checking methods

Answer 1

#include<iostream>
using namespace std;

//Error Check Method to check if the data entered is an integer or not
bool isNumeric(string str) {
        for (int i = 0; i < str.length(); i++)
                if (isdigit(str[i]) == false)
                        return false; //when one non numeric value is found, return false
        return true;
}

int main() {
#ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
#endif

        int array[10];

        for (int i = 0; i < 10; ++i) {

                string temp;
                cin >> temp;

                bool negative = false;

                if (temp[0] == '-') {

                        temp.erase(temp.begin());
                        negative = true;

                }

                if (isNumeric(temp)) {

                        array[i] = stoi(temp);

                        if (negative)
                                array[i] = -1 * array[i];

                } else {

                        cout << "Entered value is not a number. Try Again.\n";
                        i--;

                }

        }

        int Max = array[0], Min = array[0], sum = 0;

        for (int i = 0; i < 10; ++i) {
                if (array[i] < Min) {
                        Min = array[i];
                }
                if (array[i] > Max) {
                        Max = array[i];
                }
                sum = sum + array[i];
        }

        cout << "The sum of maximum and minimum numbers is " << Max + Min << endl;
        cout << "The average of the numbers is " << double(sum) / 10 << endl;

        return 0;

}

INPUT.TXT

1
2
3
4
5
6
7
8
9
10

OUTPUT.TXT
The sum of maximum and minimum numbers is 11
The average of the numbers is 5.5

NOTE: Name the input file as input.txt and output file as output.txt