Question

Write a complete C++ program that prompts 4 whole numbers as input, calculates and display average of them.

Answer 1

#include<iostream>

using namespace std;

int main(){

int a,b,c,d, sum=0;  //(declaring variable)

float average;

cout<<"First number:  ";

cin>>a;

cout<<endl;

cout<<"Second number:  ";

cin>>b;

cout<<endl;

cout<<"Third number:  ";

cin>>c;

cout<<endl;

cout<<"Fourth number:  ";

cin>>d;

cout<<endl;

sum=a+b+c+d;

average=(sum*1.00)/4;

cout<<"The average of 4 numbers is: "<<average;

return 0;

}

Answer 2

#include <iostream>
#include<vector>

class Average
{
    public:
    Average();
    private:
    std::vector<double>storage;
    double avg{};
};

Average::Average()
{
    int count{};double temp{};
    std::cout<<"How many numbers do you want to enter?\n";
    std::cin>>count;
    
    for (size_t i{};i<count;++i)
    {
        std::cout<<"Enter a number:\n";
        std::cin>>temp;storage.push_back(temp);
        avg+=temp;
    }
    
    std::cout<<"The average is: "<<avg/storage.size();
}

int main()
{
    Average start1;
    return 0;
}

Answer 3

For this question you just need the sum of the input numbers, which can be calculated by cumulative addition within a for-loop.

#include <iostream>
int main()
{
    int sum = 0;
    for (int i = 0; i < 4; ++i) {
        int n;
        std::cout << "Whole number? ";
        std::cin >> n;
        sum += n;          // <<< cumulative addition here
    }
    std::cout << "The average is " << sum/4.0 << std::endl;
         // note: 4.0 used to prevent "integer division" that returns quotient only.

    return 0;
}

Answer 4

#include <iostream>
using namespace std;
void calcAvg(double a , double b , double c , double d)
{
    double sum = a+b+c+d;
    double avg = sum/4;
    cout<<"Average of the 4 entered numbers is = "<<avg;
}
int main()
{
    double n1 , n2 , n3 , n4;
    cout<<"Enter 4 whole numbers\n";
    cin>>n1;
    cin>>n2;
    cin>>n3;
    cin>>n4;
    calcAvg(n1,n2,n3,n4);
}

Answer 5

#include<iostream>

using namespace std;

int main() {

int a,b,c,d;

cin>>a;

cin>>b;

cin>>c;

cin>>d;

cout<<(a+b+c+d)/4;

return 0;

}