Question

Please help with this coding

1.You need to dynamically allocate memory to read into a number of elements. At first, you need to determine how many numbers (here, ‘n’) to be read. Next, you need to dynamically allocate memory for ‘n’ integers. As you see,‘x’ is an integer pointer which needs to dynamically allocate memory to read ‘n’integers into it fromthekeyboard.

2 Read nintegers into the allocated block using scanf.

3. Complete the printArrayfunction to display ‘n’ integers. void printArray(int *array, const int size);

4.Complete the following functions to find the average (mean), median and the standard deviation of ‘n’ integers.

   a)double findMean(int *array, const int size);

b)double findMedian(int *array, const int size);

c)double findStandardDeviation( int*array, const int size, double average);6ptsUse the attached cheat sheet“SimpleStats.pdf” to find mean, median and standard deviation of numbers. Please be remembered, if you type only one integer, its standard deviation shouldbe set to zero.

5.Please be remembered that you need to have the array sorted to find the median value. So, you also need to write the following sortArray function:void sortArray(int *array, const int size);

6.The element in the sorted array should be arranged in ascending order. Inside sortArrayfunction, you need to call the swapElementsfunction as mentioned below. So, you also need to complete the swapElement function.void swapElements(int *a, int *b);

7.Lastly, you need to free the allocated memory....................................................................

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void swapElements(int *a, int *b);
void sortArray(int *array, const int size);
void changeElements(int *val);
void printArray(int *array, const int size);
double findMean(int *array, const int size);
double findMedian(int *array, const int size);
double findStandardDeviation( int *array, const int size, double average);

int main(){

   int n, *x;
        double mean = 0.0, median = 0.0, stdDev = 0.0;

   printf("This is the basic part of the program that asks the user to type the number of integers, i.e., 'n'. Next, allocate memory for 'n' integers, read the values of 'n' integers into the allocated memory usining scanf; next, find the mean, median and average of 'n' integers.Lastly, the allocated memory needs to be freed.\n");
      
   printf("\nRead using scanf how many integers you would like to type:\n");
        scanf("%d", &n);

      
   /*****************************************************************/

   //x is not automatically assigned a memory block when it is defined as a pointer variable, you need to allocate a block
   //of memory large enough to hold 'n' integers
        // Write the function that allocates memory to hold 'n' integers

      
        printf("Please type 'n' integers: \n");
   /***********************************************************************/
   //Read in the list of numbers 'n' into the allocated block using scanf
  
      

        printf("Displaying the numbers:\n");

       // Call printArray to display the integers    

        // Find the mean of integers using findMean function
        printf("Mean of the numbers is: %f\n", mean);

        // Fidn the median of integers using findMedian function
        printf("Median of the numbers is: %f\n", median);
        // Find the standard deviation of integers using findStandardDeviation function
         printf("Standard deviation of the numbers is: %f\n", stdDev);
  
       //Deallocate the memory ;
      
      
      
        return 0;
}

void printArray( int *array, const int size){ int j;. for ( j = 0; j < size; j++){. printf("Array index is: %d and value is: %d\n", j, array[j]);. } printf("\n");. }

void sortArray(int *array, const int size){

     //Complete this function
}

void swapElements( int *x, int *y){

     // Complete this function

}

double findMean(int *array, const int size){

    // COmplete this function
}

double findMedian(int *array, const int size){

   //Complete this function;
}

double findStandardDeviation( int *array, const int size, double average){

       // Complete this function

}

Answer 1

// C program to create a dynamic array and perform operations on the array
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void swapElements(int *a, int *b);
void sortArray(int *array, const int size);
void changeElements(int *val);
void printArray(int *array, const int size);
double findMean(int *array, const int size);
double findMedian(int *array, const int size);
double findStandardDeviation( int *array, const int size, double average);

int main(void) {

   int n, *x, i;
   double mean = 0.0, median = 0.0, stdDev = 0.0;

   printf("This is the basic part of the program that asks the user to type the number of integers, i.e., 'n'. \nNext, allocate memory for 'n' integers, read the values of 'n' integers into the allocated memory using scanf; \nnext, find the mean, median and average of 'n' integers.Lastly, the allocated memory needs to be freed.\n");

   printf("\nRead using scanf how many integers you would like to type:\n");
   fflush(stdout);
   scanf("%d", &n);

   /*****************************************************************/

   //x is not automatically assigned a memory block when it is defined as a pointer variable, you need to allocate a block
   //of memory large enough to hold 'n' integers
   // Write the function that allocates memory to hold 'n' integers

   x = (int*)malloc(sizeof(int)*n);
   printf("Please type 'n' integers: \n");
   /***********************************************************************/
   //Read in the list of numbers 'n' into the allocated block using scanf
   for(i=0;i<n;i++)
   {
       printf("Element-%d : ",i+1);
       fflush(stdout);
       scanf("%d",&x[i]);
   }

   printf("Displaying the numbers:\n");

   // Call printArray to display the integers
   printArray(x,n);
   // Find the mean of integers using findMean function
   mean = findMean(x,n);
   printf("Mean of the numbers is: %f\n", mean);

   // Find the median of integers using findMedian function
   median = findMedian(x,n);
   printf("Median of the numbers is: %f\n", median);
   // Find the standard deviation of integers using findStandardDeviation function
   stdDev = findStandardDeviation(x,n,mean);
   printf("Standard deviation of the numbers is: %f\n", stdDev);

   //Deallocate the memory ;
   free(x);
   return EXIT_SUCCESS;
}

void printArray( int *array, const int size){
   int j;
   for ( j = 0; j < size; j++)
   {
       printf("Array index is: %d and value is: %d\n", j, array[j]);
   }
   printf("\n");
}

void sortArray(int *array, const int size){

   int i,j;
   int min ;
   for(i=0;i<size-1;i++)
   {
       min = i;
       for(j=i+1;j<size;j++)
       {
           if(array[j] < array[min])
               min = j;
       }

       if(i != min)
       {
           swapElements(&array[i],&array[min]);
       }
   }
}

void swapElements( int *x, int *y){

   int temp = *x;
   *x = *y;
   *y = temp;
}

double findMean(int *array, const int size){

   int total = 0;
   int i;
   for(i=0;i<size;i++)
       total += array[i];
   if(size > 0)
       return(((double)total)/size);
   return 0;
}

double findMedian(int *array, const int size){

   sortArray(array,size);
   double median;
   if(size > 0)
   {
       if(size%2 == 0)
       {
           median = ((double)((double)array[(int)((size-1)/2)] + (double)array[(int)(size/2)]))/2;
       }else
           median = array[(int)(size/2)];
   }else
       median = 0;
   return median;

}

double findStandardDeviation( int *array, const int size, double average){

   int i;
   double deviation = 0;
   for(i=0;i<size;i++)
   {
       deviation += pow((double)(array[i]-average),2);
   }

   if(size > 0)
   {
       deviation = deviation/size;
       deviation = sqrt(deviation);
       return deviation;
   }

   return 0;
}

//end of program

Output: