Compare 2 int arrays

Tim Camper

Trying to compare 2 int arrays.

Example:

public static void Main()
    {
        int[] T1 = new int[3] { 1, 2, 3 };
        int[] D1 = new int[3] { 4, 5, 6 };

Would like to compare value T1 index[0...3] to D1 index[0...3].
There are 3 possibilities I am interested in and capturing.

1. are they equal
2 & 3. is one < or > then the other.

Any help on structuring a compare or equals statement would be appreciated.

5 Replies

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Kirtan Patel17y ago

here is simple Logic to Compare 2 arrays the condition is only the Number of Elements in Arrays must be same


            int[] x= {1,2,3};
            int[] y = { 1, 2, 7 };

            bool unequalfound=false ;
            for (int i = 0; i < 3; i++)
            {
                if (x[i] == y[i])
                {

                }
                else
                {
                    unequalfound = true;
                    break;
                }
            }

            if (unequalfound == true)
            {
               Console.Write("Array Are NotSame");
            }
            else
            {
                Console.Write("Arrays Are Same");
            }

H Ghasemi17y ago
Yeah I mean Number of elements. Execuse me my english is poor. My friend I think it depends on what we want to do. My code compare all elements and result is base on what element is greater or smaller than another. But I think you need this code: In this code if t[i]<=d[i] >> result[i]=false if t[i] > d[i] >> rsult[i]=true private void buttonCompare_Click(object sender, EventArgs e) { int[] t = new int[3] { 6, 5, 7 }; int[] d = new int[3] { 3, 5, 4 }; bool[] rs = CompareArray(t, d); for (int m = 0; m < rs.Length; m++) listBox1.Items.Add(rs[m].ToString()); } public bool[] CompareArray(int[] t, int[] d) { int number; if (t.Length < d.Length) number = t.Length; else number = d.Length; bool[] result = new bool[number]; for (int i = 0; i < number; i++) { if (t[i] <= d[i]) { result[i] = false; } else if (t[i] > d[i]) { result[i] = true; } } return result; }

Danatas Gervi17y ago

You code will work.
But what do you mean as "array index"?
Sum of all elements? Lenght of array? Index - this is number of element in array!

Your task is not usial - seems you want to compare only first element of boths arrays....

so it may be shorter to write :

 public int CompareArray(int[] t, int[] d)
        {           
            if (t.Length > 0)
            {
                if (d.Length > 0)
                {
                    return Math.Sign( t[0]- d[0]);
                }               
            }
            return 0;           
        }

But I am sure, this is not so simple.
Lets continue to develope the algoritm of comparing:

take t - array of int and d - array of int.
if t[0] > d[0]   -> true or false
if t[1] > d[0]   -> true or false
if t[2] > d[0]   -> true or false

if t[0] > d[1]   -> true or false
if t[1] > d[1]   -> true or false
if t[2] > d[1]   -> true or false

if t[0] > d[2]   -> true or false
if t[1] > d[2]   -> true or false
if t[2] > d[2]   -> true or false

how do you want to collect the resut?

H Ghasemi17y ago
In my opinion, two arrays must have equal index number. for example 3. the best method must be like this: if result=0 then Equal if result=1 then First array > Second array if result=-1 then First array < Second array private void buttonCompare_Click(object sender, EventArgs e) { int[] t = new int[3] { 6, 5, 7 }; int[] d = new int[3] { 3, 5, 4 }; // in this example t > d then rs will be 1 int rs = CompareArray(t, d); } public int CompareArray(int[] t, int[] d) { int result = 0; int num = d.Length; for (int i = 0; i < num; i++) { if (t[i] < d[i]) { result = -1; break; } else if (t[i] > d[i]) { result = 1; break; } } return result; } Hope this was helpfull
Danatas Gervi17y ago
What do you want to get as result of this comparation?

May be array of results?