Question #49775

Write a function called nRandomNumbers( ) that Generates N random integers between -250 and 250 (inclusive) and saves them in a file called number.txt, (Use the function srand()). Prints all the generated integers. Finds the average of all the negative integers, and the maximum of all the positive integers. Returns the the average. Then, write a main program that Prompts the user to input the value of N. Calls the function nRandomNumbers( ). Prints the average of all the negative integers

Expert's answer

////////////////////////////////////////////////////////////////

#include <iostream>

#include <fstream> // for outputting to file

#include <time.h> // for time()

#include <conio.h> // for getch()

#include <stdlib.h> // or <cstdlib>

using namespace std;

//prototypes

double RandomNumbers(int N);

int* GetRandomNumbers(int N);

void SaveNumbers(int* numbers, int N);

void PrintNumbers(int* numbers, int N);

double GetAverage(int* numbers, int N);

double GetNegAverage(int* numbers, int N);

int GetMaxPositive(int*numbers, int N);

void main()

{

cout << "Enter the amount ofrandom numbers: ";

int N;

cin >> N;

double average = RandomNumbers(N);

cout << "Your average: "<< average << endl;

cout << "Press any key tocontinue...";

getch();

}

double RandomNumbers(int N);

{

int* randNumbers = GetRandomNumers(N);

cout << "Saving tofile...\n\n";

SaveNumbers(randNumbers, N);

cout << "Yournumbers:\n";

PrintNumbers(randNumbers, N);

double negAvg = GetNegAverage(randNumbers,N);

cout << "Your negativeaverage: " << negAvg << endl;

int maxPositive =GetMaxPositive(randNumbers, N);

return GetAverage(randNumbers, N);

}

int* GetRandomNumbers(int N)

{

srand(time(NULL));

int* numbers = new int[N];

for (int i = 0; i < N; i++)

{

numbers[i] = rand() %251 - 250;

}

return numbers;

}

void SaveNumbers(int* numbers, int N)

{

ofstream file;

file.open("number.txt"); //it'll be written in directory with your program

for (int i = 0; i < N - 1; i++)

{

file <<numbers[i] << " ";

}

file << numbers[N - 1];

file.close();

}

void PrintNumbers(int* numbers, int N)

{

for (int i = 0; i < N; i++)

{

char space = N % 10 ==0 ? '\n' : ' '; // if in one line there is 10 items, it'll go down; esle it

print space

cout <<numbers[i] << space;

}

cout << endl;

}

double GetAverage(int* numbers, int N)

{

double sum = 0;

for (int i = 0; i < N; i++)

{

sum += numbers[i];

}

return sum / N;

}

double GetNegAverage(int* numbers, int N)

{

double sum = 0;

int negNumCount = 0;

for (int i = 0; i < N; i++)

{

if (numbers[i] < 0)

{

sum+= numbers[i];

negNumCount++;

}

}

return sum / negNumCount;

}

int GetMaxPositive(int* numbers, int N)

{

int max = numbers[0];

for (int i = 1; i < N; i++) // westart from 1, because element with index 0 we already used

{

if (numbers[i] >max)

{

max= numbers[i];

}

}

return max;

}

#include <iostream>

#include <fstream> // for outputting to file

#include <time.h> // for time()

#include <conio.h> // for getch()

#include <stdlib.h> // or <cstdlib>

using namespace std;

//prototypes

double RandomNumbers(int N);

int* GetRandomNumbers(int N);

void SaveNumbers(int* numbers, int N);

void PrintNumbers(int* numbers, int N);

double GetAverage(int* numbers, int N);

double GetNegAverage(int* numbers, int N);

int GetMaxPositive(int*numbers, int N);

void main()

{

cout << "Enter the amount ofrandom numbers: ";

int N;

cin >> N;

double average = RandomNumbers(N);

cout << "Your average: "<< average << endl;

cout << "Press any key tocontinue...";

getch();

}

double RandomNumbers(int N);

{

int* randNumbers = GetRandomNumers(N);

cout << "Saving tofile...\n\n";

SaveNumbers(randNumbers, N);

cout << "Yournumbers:\n";

PrintNumbers(randNumbers, N);

double negAvg = GetNegAverage(randNumbers,N);

cout << "Your negativeaverage: " << negAvg << endl;

int maxPositive =GetMaxPositive(randNumbers, N);

return GetAverage(randNumbers, N);

}

int* GetRandomNumbers(int N)

{

srand(time(NULL));

int* numbers = new int[N];

for (int i = 0; i < N; i++)

{

numbers[i] = rand() %251 - 250;

}

return numbers;

}

void SaveNumbers(int* numbers, int N)

{

ofstream file;

file.open("number.txt"); //it'll be written in directory with your program

for (int i = 0; i < N - 1; i++)

{

file <<numbers[i] << " ";

}

file << numbers[N - 1];

file.close();

}

void PrintNumbers(int* numbers, int N)

{

for (int i = 0; i < N; i++)

{

char space = N % 10 ==0 ? '\n' : ' '; // if in one line there is 10 items, it'll go down; esle it

print space

cout <<numbers[i] << space;

}

cout << endl;

}

double GetAverage(int* numbers, int N)

{

double sum = 0;

for (int i = 0; i < N; i++)

{

sum += numbers[i];

}

return sum / N;

}

double GetNegAverage(int* numbers, int N)

{

double sum = 0;

int negNumCount = 0;

for (int i = 0; i < N; i++)

{

if (numbers[i] < 0)

{

sum+= numbers[i];

negNumCount++;

}

}

return sum / negNumCount;

}

int GetMaxPositive(int* numbers, int N)

{

int max = numbers[0];

for (int i = 1; i < N; i++) // westart from 1, because element with index 0 we already used

{

if (numbers[i] >max)

{

max= numbers[i];

}

}

return max;

}

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