Pointing Array between functions
Hi everyone, I'm stuck here and I need help on how am I suppose to point the array to another function to edit.
This program is suppose to take in a matrix with side (NxN) and will output the matrix by adding the four nearby number together.
eg.
0 1 2
3 4 5
6 7 8
will output
8 12
20 24
The code works, but somehow at the second row, [1][0] it adds the new [0][0] and [0][1]...
Anybody would be kind enough to brainstorm with me?
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#include<iostream>
#include<string>
#include<cstdlib>
#include <iomanip>
using namespace std;
int ask();
int initialize_matrix(int);
int is_positive_int(string);
int** iterative_calculate_result(int**, int);
/*********************************************************************
** Function: main()
** Description: The main function that contains other functions
** Parameters: -
** Pre-Conditions: -
** Post-Conditions: Runs the functions
*********************************************************************/
int main() {
int N;
N = ask();
initialize_matrix(N);
}
/*********************************************************************
** Function: ask()
** Description: Asks for N from user
** Parameters: None
** Pre-Conditions: main() is being run
** Post-Conditions: Returns N to main()
*********************************************************************/
int ask() {
string Nstr;
int pos, N;
cout << "Enter N for Matrix (N x N): " << endl;
cin >> Nstr;
pos = is_positive_int(Nstr);
if(pos == 1) {
N = atoi(Nstr.c_str());
return N; }
else {
cout << "Error try again!" << endl;
exit(1); }
}
/*********************************************************************
** Function: is_positive_int(string Nstr)
** Description: Takes the string from ask() to check whether positive
** Parameters: Nstr
** Pre-Conditions: Nstr
** Post-Conditions: returns is positive or not
*********************************************************************/
int is_positive_int(string Nstr) {
for(int i = 0; i < Nstr.size(); i++ )
{
if(Nstr.at(i) == '.' || Nstr.at(i) == '-')
return 0;
else
return 1;
}
}
/*********************************************************************
** Function: initialize_matrix(int N)
** Description: Takes input for matrix and prints the matrix
** Parameters: N
** Pre-Conditions: N is positive
** Post-Conditions: Prints the matrix
*********************************************************************/
int initialize_matrix(int N) {
int ROW = N, COL = N;
int **mat;
int k = 0;
mat = new int*[ROW];
for(int i = 0; i < ROW; i++)
mat[i] = new int[COL];
for(int i = 0; i < ROW; i++)
for(int j = 0; j < COL; j++)
mat[i][j] = k++;
for(int i = 0; i < N; i++) {
for(int j = 0; j < N; j++) {
cout << mat[i][j];
cout << " ";
}
cout << endl;
}
mat = iterative_calculate_result(mat, N);
}
/*********************************************************************
** Function: iterative_calculate_result(int** arr, int N)
** Description: Calculates the 4 nearest number in the matrix
** Parameters:
** Pre-Conditions:
** Post-Conditions:
*********************************************************************/
int** iterative_calculate_result(int** arr, int N) {
int a, b, c ,d;
int ** p;
p = arr;
for(int i = 0; i < N-1; i++) {
for(int j = 0; j < N-1; j++) {
a = arr[N-N][N-(N-j)];
j++;
b = arr[N-N][N-(N-j)];
j--;
i++;
c = arr[N-(N-i)][N-(N-j)];
j++;
d = arr[N-(N-i)][N-(N-j)];
j--;
i--;
arr[i][j] = a + b + c + d;
}
}
for(int i = 0; i < (N-1); i++) {
for(int j = 0; j < (N-1); j++) {
cout << arr[i][j];
cout << " ";
}
cout << endl;
}
return arr;
}
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