Question

I need help fixing my code: In C++ ***************

1) I want to sum the digits of an n*n matrix

2) find the average

I have completed the rest

****Do not use C++ standard library. You must use pointers and pointer arithmetic to represent the matrix and to navigate through it.

MY CODE: (I have indicated at which point I need help)

#include <iostream>

using namespace std;

void swap(int *xp, int *yp)

{

int temp = *xp;

*xp = *yp;

*yp = temp;

}

void bubbleSort(int arr[], int n)

{

int i;

int j;

for (i = 0; i < n-1; i++)

for (j = 0; j < n-i-1; j++)

if (arr[j] > arr[j+1])

swap(&arr[j], &arr[j+1]);

}

int main() {

int n;

cout<<"Please enter the n dimensions of your array: "<<endl;

cin>>n;

cout<<endl;

int arr[n][n];

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

arr[i][j] = rand() % 10;

}

}

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

cout << arr[i][j] << "";

}

cout << endl;

}

int largest = -100000;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

if(*( *(arr + i) + j) > largest){

largest = *( *(arr + i) + j);

}

}

}

cout <<endl<< "The largest number is : " << largest << endl;

int smallest = 100000000;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

if(*( *(arr + i) + j) < smallest){

smallest = *( *(arr + i) + j);

}

}

}

cout << "The smallest number is : " << smallest << endl;

int med[n*n];

int k = 0;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

med[k++] = *( *(arr + i) + j);

}

}

cout<<endl<<"Listed digits from your array are : "<<endl;

for(int i=0; i<n*n; i++){

cout<<med[i];

}

cout << endl;

bubbleSort(med, n*n);

cout<<endl<<"The sorted digits from your array are : "<<endl;

for(int i=0; i<n*n; i++){

cout << med[i];

}

cout << endl;

cout <<endl << "The median digit is : "<< med[n*n/2]<< endl;

//*******I NEED HELP FROM THIS POINT*********

cout<< endl;

cout<<endl<<"The average value of the digits in your array is: "<<(med[n*n/2]+med[n*n/2 +1])/2<<endl;

cout<<endl;

cout<<endl<< "the sum of the digits in the arrray is: "<<endl;

for(int i=0;i<n*n;i++){

for(int j=0; j<n*n; j++){

cout<<i+j;

}

}

}

Answer 1

#include <iostream>

using namespace std;

void swap(int *xp, int *yp)

{

int temp = *xp;

*xp = *yp;

*yp = temp;

}

void bubbleSort(int arr[], int n)

{

int i;

int j;

for (i = 0; i < n-1; i++)

for (j = 0; j < n-i-1; j++)

if (arr[j] > arr[j+1])

swap(&arr[j], &arr[j+1]);

}

int main() {

int n;

cout<<"Please enter the n dimensions of your array: "<<endl;

cin>>n;

cout<<endl;

int arr[n][n];

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

arr[i][j] = rand() % 10;

}

}

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

cout << arr[i][j] << "";

}

cout << endl;

}

int largest = -100000;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

if(*( *(arr + i) + j) > largest){

largest = *( *(arr + i) + j);

}

}

}

cout <<endl<< "The largest number is : " << largest << endl;

int smallest = 100000000;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

if(*( *(arr + i) + j) < smallest){

smallest = *( *(arr + i) + j);

}

}

}

cout << "The smallest number is : " << smallest << endl;

int med[n*n];

int k = 0;

for(int i=0; i<n; i++){

for(int j=0; j<n; j++){

med[k++] = *( *(arr + i) + j);

}

}

cout<<endl<<"Listed digits from your array are : "<<endl;

for(int i=0; i<n*n; i++){

cout<<med[i];

}

cout << endl;

bubbleSort(med, n*n);

cout<<endl<<"The sorted digits from your array are : "<<endl;

for(int i=0; i<n*n; i++){

cout << med[i];

}

cout << endl;

cout <<endl << "The median digit is : "<< med[n*n/2]<< endl;

//*******I NEED HELP FROM THIS POINT*********

cout<< endl;

double sum=0;
int count=0;

//finds the sum of elements in the array
for(int i=0; i<n; i++)

for(int j=0; j<n; j++){
sum =sum+ *( *(arr + i) + j);
count++;
}

cout<<endl<<"The average value of the digits in your array is: "<<(sum)/count<<endl;

cout<<endl;

cout<<endl<< "the sum of the digits in the arrray is: "<<sum<<endl;

for(int i=0;i<n*n;i++){

for(int j=0; j<n*n; j++){

cout<<i+j;

}

}

}

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