Question

Write a C++ program that inputs a sequence of integers into a vector, computes the average, and then outputs the # of input values, the average, and the values themselves. There are 0 or more inputs values, followed by a negative value as the sentinel; the negative value is not stored and not counted. The following sample input:

10
20
0
99
-1

would produce the following output:

N: 4
Avg: 32.25
10
20
0
99

The main program has been written for you, your job is to implement the two functions InputData andGetAverage. See the comments in the "student.cpp" file for specific implementation details.

main.cpp

#include <iostream>
#include <vector>

using namespace std;

// functions from student.cpp:
int InputData(vector<int>& V);
double GetAverage(vector<int> V, int N);

int main()
{
// assume at most 100 inputs:
vector<int> inputs(100);
int N;
double avg;

N = InputData(inputs);
avg = GetAverage(inputs, N);

cout << "N: " << N << endl;
cout << "Avg: " << avg << endl;

for (int i = 0; i < N; ++i)
{
cout << inputs.at(i) << endl;
}

return 0;
}

student.cpp

int InputData(vector<int>& V)
{

// TODO
  
return 0;
}

//
// GetAverage
//
// Returns the average of the first N values in the vector; if N is 0 then
// 0.0 is returned.
//
double GetAverage(vector<int> V, int N)
{

// TODO

return 0.0;
}

Answer 1

need to change the code for desired functionality of program.

if you don't want to change main program then just copy the 2 function added at last in the code.

here is edited code:

main.cpp :

#include <iostream>
#include <vector>
using namespace std;

// functions from student.cpp:
int InputData(vector<int>& V);
double GetAverage(vector<int> V, int N);

int main() {
   // declare variables
   vector<int> inputs;
   int N;
   double avg;

   // get input from user
   cout << "Enter numbers to calculate Average :(enter negative number to stop entering)" << endl;
   int input; // variable input to store input number from use
   // while loop to get input numbers
   while (true) {
       cin >> input; // get user input
       if (input < 0) {
           // negative number act as sentinel value
           break; // break the while loop and calculate average
       }
       else {
           // add number to vactor
           inputs.push_back(input);
       }
   }

   N = InputData(inputs);
   avg = GetAverage(inputs, N);
   cout << "N: " << N << endl;
   cout << "Avg: " << avg << endl;
   for (int i = 0; i < N; ++i)   {
       cout << inputs.at(i) << endl;
   }
   return 0;
}

int InputData(vector<int>& V){
   return V.size();
}

// Returns the average of the first N values in the vector; if N is 0 then
// 0.0 is returned.
double GetAverage(vector<int> V, int N)
{
   if (N == 0) {
       return 0.0;
   }
   else {
       int sum = 0; //sum of total numbers counted
       // loop for each number to count average
       for (int i = 0; i < N; i++) {
           sum = sum + V.at(i); // add each number to the sum
       }
       // calculate average
       double avg = sum / (N * 1.0); //multiply by 1.0 to get double division insted of integer division
       return avg;
   }
}