Programming help: 20x20 Array

[lalala423]

Write a program that finds the greatest sum of three adjacent numbers in any direction (up, down, left, right, or diagonally) in a 20x20 grid of numbers.

All input data must be obtained from the stdin prompt. You can feed in the data from a file by using input redirection. The input file will contain the matrix of numbers from the top left to bottom right.

Example input file:

input.txt

08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48

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1) The program should be purely Object Oriented containing a constructor, destructor and other helper functions.
2) The data members must be private and accessible only through getter and setter functions (accessors and mutators).
3) No global variables may be used. The 2D data grid must be passed in to a function using pointers.
4) The program should contain a function to obtain user input (this should not be the constructor), a function to display output, and at least one other function to perform the calculations.

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For this program, i have an intArray.h, intArray.cpp, and main.cpp

This is what I have so far:

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intArray.h

#ifndef INT_ARRAY_H
#define INT_ARRAY_H

#include <iostream>
#include <cstdlib>
#include <iomanip>

using namespace std;

class intArray{
//variables
int size[20][20];
int* data;

public:
//constructor and destructor
intArray();
~intArray();

//getters
int getSize();
int getValue(int column, int row, int value);

//setters
//void setValue(int value, int index);

//read&display
void display();
void read();

};
#endif //INT_ARRAY_H

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intArray.cpp

#include <iostream>
#include "intArray.h"

using namespace std;

//const int num = 20;
int width = 20;
int height = 20


//constructor
intArray::intArray(){

int size [height][width];
data = new int [size];

    if (data == NULL){
        cout << "ERROR: Insufficient Memory" << endl;
        exit(1);
    }
    else {
        for(int i = 0; i < height; ++i){
            for(int j = 0; j < weight; ++j){
                data[i][j] = 0;
            }
        }
    }
}

//destructor
intArray::~intArray(){
    if(data != NULL){   
        delete [] data;
    }

}

//display
void intArray::display(){
    for(int i = 0; i < height; i++){
        for (int j = 0; j < weight; j++){
            cout << size[i][j] << " ";
        }
            cout << endl;
    }

}

//read
void intArray::read(){
    for(int i = 0; i < height; i++)
        for (int j = 0; j < weight; j++)
            cin >> size[i][j];
}

//getters
int intArray::getSize(){
    return(size);
}

int intArray:: getValue(int column, int row, int value){
        for(i = 0; i < height; ++i){
            for(j = 0; j < weight; ++j){
               
            }
        }
}

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main.cpp

#include <iostream>
#include <fstream>

#include "intArray.h"

using namespace std;

int main(int argc, char **argv){

intArray myArray;

ifstream inFile;
inFile.open("input.txt");
    if (inFile.fail()){
        cout << "ERROR!!! Input file cannot be opened. Please try again." << endl;
        exit(0);
    }
    else{
        cout << "File opened!";
    }





cout << endl;
return(0);
}

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PLEASE HELP! I don't know what to do for main.cpp.. and also I'm not sure what to type for intArray.cpp. Any help would be much appreciated!

[WaltP]

PLEASE HELP!

Don't shout. We can hear you!

I don't know what to do for main.cpp..

Function call that solve the problem.
Loops to go through the matrix...
IFs to test the return values from the calculation with the greatest sum found so far.
No file access at all: "All input data must be obtained from the stdin prompt."

I suggest you start with accepting the input and loading it into your matrix. Then output the matrix to be sure it was loaded properly. That and that alone.

[pseudorandom21]

I might suggest a polymorphic solution to getting your input, I think it will greatly simplify the process of reading from stdin/cin or a file.

void read(std::istream &in){
//Feel free to swap width/height if needed.
  for(size_t i = 0; i < width; i++){
     for(size_t j = 0; j < height; j++){
        in >> data[i][j];
     }
  }
}

In your intArray constructor, I don't really know what you're doing with this: int size [height][width]; but I doubt it is what you want to do.

There is also a mysterious "weight" variable that appears in your code, which may or may not exist.