samedi 2 avril 2016

How do I compare 2 arrays to see if they have the same contents?

My code works so far but I have a logic error in the 17th to 30th line of code and I can't seem to figure it out. I feel like I have too much going on.

The prompt for the problem is as follows:

Two two-dimensional arrays m1 and m2 are identical if they have the same contents. Write a function that returns true if m1 and m2 are identical, using the following header:

const int SIZE = 3;    

bool equals(const int m1[][SIZE], const int m2[][SIZE]);

Write a test program that prompts the user to enter two 3 x3 arrays of integers and displays whether the two are identical. Here are the sample runs (below).


Enter m1: 51 25 22 6 1 4 24 54 6

Enter m2: 52 22 25 6 1 4 24 54 6

output : Two arrays are identical

Enter m1: 51 5 22 6 1 4 24 54 6

Enter m2: 51 22 25 6 1 4 24 54 6

output: Two arrays are not identical


This is my code (sorry if it is bad and messy im still learning)

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>

using namespace std;

const int SIZE = 3;

bool equals(const int m1[][SIZE], const int m2[][SIZE]) {

    bool choice = true;

    while (choice) {
        for (int i = 0; i < SIZE; i++) {
            for (int j = 0; j < SIZE; j++) {
                if (m1[i][j] != m2[i][j]) {                                                        // code is fine until here. There is a logic error somewhere. m1: 123456789 m2: 987654321 output: array not identical
                    for (int k = 0; k < SIZE; k++) {
                        for (int h = 0; h < SIZE; h++) {
                            if (m1[i][j] == m2[k][h]) {
                                return true;
                            }
                            else {
                                choice = false;
                                return false;
                            }
                        }
                    }
                }
                else {
                    return true;
                }
            }
        }

    }
}

int main() {

    string input1, input2, num1, num2;
    int count1 = 0, count2 = 0;
    int a = 0, b = 0, c = 0;
    int a2 = 0, b2 = 0, c2 = 0;
    int arr1[SIZE][SIZE];
    int arr2[SIZE][SIZE];

    cout << "Enter m1: ";
    getline(cin, input1);
    stringstream line1(input1);

    cout << "Enter m2: ";
    getline(cin, input2);
    stringstream line2(input2);

    while (line1 >> num1) {

        if (count1 < 3) {
            stringstream(num1) >> arr1[0][a];
            a++;
        }
        else if (count1 >= 3 && count1 <= 5) {
            stringstream(num1) >> arr1[1][b];
            b++;
        }
        else {
            stringstream(num1) >> arr1[2][c];
            c++;
        }
        count1++;
    }

    while (line2 >> num2) {

        if (count2 < 3) {
            stringstream(num2) >> arr2[0][a2];
            a2++;
        }
        else if (count2 >= 3 && count2 <= 5) {
            stringstream(num2) >> arr2[1][b2];
            b2++;
        }
        else {
            stringstream(num2) >> arr2[2][c2];
            c2++;
        }
        count2++;
    }

    bool answer = equals(arr1, arr2);

   if (answer) {
        cout << "Two arrays are identical" << endl;
   }
   else {
        cout << "Two arrays are not identical" << endl;
   }

   system("Pause");

   return 0;
}

Thank You

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