C++ Arrays

arrays/2D-array.cpp

@@ -0,0 +1,28 @@
+// declaration and initialization of array
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int arr[5][5];
+    for (int i = 0; i < 2; i++)
+    {
+        for (int j = 0; j < 2; j++)
+        {
+            cout << "enter array element " << i << j << " : ";
+            cin >> arr[i][j];
+            cout << endl;
+        }
+    }
+    cout << "created array: [ ";
+    for (int i = 0; i < 2; i++)
+    {
+        for (int j = 0; j < 2; j++)
+        {
+            // using for loop
+            cout << arr[i][j] << " ";
+        }
+        cout << endl;
+    }
+    cout << "]";
+    return 0;
+}

arrays/arryinsertion.cpp

@@ -0,0 +1,26 @@
+// declaration and initialization of array
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int arr[5];
+    for (int i = 0; i < 5; i++)
+    {
+        cout << "enter array element " << i << " : ";
+        cin >> arr[i];
+        cout << endl;
+    }
+    cout << "created array: [ ";
+    for (int i = 0; i < 5; i++)
+    {
+        // using for loop
+        cout << arr[i] << " , ";
+    }
+    // using for each loop
+    for (int x : arr)
+    {
+        cout << x << " ";
+    }
+    cout << "]";
+    return 0;
+}

arrays/binarysearcharray.cpp

@@ -0,0 +1,36 @@
+// linear search using arrays
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int arr[10];
+    int key = 0;
+    cout << "Enter key value to be searched: ";
+    cin >> key;
+    for (int i = 0; i < 8; i++)
+    {
+        cout << "enter array element " << i << " : ";
+        cin >> arr[i];
+        cout << endl;
+    }
+    int low = 0, high = 8, mid = 0;
+    while (low <= high)
+    {
+        mid = (low + high) / 2;
+        if (key == arr[mid])
+        {
+            cout << "Key found " << mid;
+            return 0;
+        }
+        else if (key < arr[mid])
+        {
+            high = mid - 1;
+        }
+        else
+        {
+            low = mid + 1;
+        }
+    }
+    cout << "Key not found!";
+    return 0;
+}

arrays/linearsearcharray.cpp

@@ -0,0 +1,27 @@
+// linear search using arrays
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int arr[10];
+    int key = 0;
+    cout << "Enter key value to be searched: ";
+    cin >> key;
+    for (int i = 0; i < 8; i++)
+    {
+        cout << "enter array element " << i << " : ";
+        cin >> arr[i];
+        cout << endl;
+    }
+
+    for (int i = 0; i < 8; i++)
+    {
+        if (key == arr[i])
+        {
+            // using for loop
+            cout << "Key found at index: " << i;
+        }
+    }
+
+    return 0;
+}