Question

Use c++ as programming language. The file needs to be created ourselves

(ARRAYS) Write a program that contains the following functions: 1. A function to read integer values into a one-dimensional array of size N. 2. A function to sort a one-dimensional array of size N of integers in descending order. 3. A function to find and output the average of the values in a one dimensional array of size N of integers. 4. A function to output a one-dimensional array of size N of integers in reverse order, each five values on a separate line 5. A main() function to input an integer K, define a one-dimensional array of size K of integers, and then call the above functions to read, sort, print the array, and print the average. Note Before all input should be from a text file with your last name as physical name, and all output should be to a text file with your first name as physical name.

Answer 1

#include <iostream>
using namespace std;

void readArray(int [], int);
void sortDescendingArray(int [], int);
void averageArray(int [], int);
void printReverseArray(int [], int);

FILE *inputFP, *outputFP;

int main(int argc, char const *argv[])
{
   int K;

   inputFP = fopen("input.txt", "r");
   outputFP = fopen("output.txt", "w+");

   fscanf(inputFP, "%d", &K);
  
   int array[K];

   readArray(array, K);

   sortDescendingArray(array, K);

   averageArray(array, K);

   printReverseArray(array, K);

   fclose(inputFP);
   fclose(outputFP);

   return 0;
}

void readArray(int array[], int N)
{
   fprintf(outputFP, "Taking input into the array.\n");

   for(int i=0; i<N; i++)
   {
       fscanf(inputFP, "%d", &array[i]);
   }

   return;
}

void printReverseArray(int array[], int N)
{
   fprintf(outputFP, "Writing the numbers in reverse order.\n");
  
   int i;

   for(i=0; i<N; i++)
   {
       if(i % 5 == 0)
           fprintf(outputFP, "\n");
       fprintf(outputFP, "%d ", array[i]);
   }

   return;
}

void sortDescendingArray(int array[], int N)
{
   fprintf(outputFP, "Sorting the array.\n");
   int i,j,k;
   int max;

   for(i=0; i<N-1; i++)
   {
       max = array[i];
       for(j=i; j<N; j++)
       {
           if(array[j] > max)
           {
               max = array[j];
               k = j;
           }
       }
       swap(array[i], array[k]);
   }
}

void averageArray(int array[], int N)
{
   int sum=0;
   for(int i=0; i<N; i++)
   {
       sum += array[i];
   }

   fprintf(outputFP, "The average of the array is %d.\n", sum/N);
}