Structures in cpp

Structures/Heapmemo.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int *p;
+    // allocate memory in heap--> create an array of sixe 5 in heap
+    p = (int *)malloc(5 * sizeof(int)); // int arr[5];//c-lang
+    p = new int[5];                     // cpp-lang
+    // Allocate memory in heap - create an array of size 5 in heap
+    p = new int[5]; // C++ way of allocating dynamic memory
+
+    // Inserting values into the dynamically allocated array
+    for (int i = 0; i < 5; i++)
+    {
+        p[i] = i + 1; // Assigning values to array elements
+    }
+
+    // Printing the values stored in the dynamically allocated array
+    for (int i = 0; i < 5; i++)
+    {
+        cout << p[i] << " ";
+    }
+    cout << endl;
+
+    // Don't forget to deallocate memory to avoid memory leaks
+    delete[] p;
+    return 0;
+}

Structures/heapmember.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+struct Rectangle
+{
+    /* data */
+    int length;
+    int breadth;
+};
+
+int main()
+{
+    // pointer to structure
+    struct Rectangle *p;
+    p = new Rectangle;
+    p->length = 10;
+    p->breadth = 20;
+    cout << "value of length: " << p->length << endl;
+    cout << "value of breadth: " << p->breadth << endl;
+    cout << "Area: " << (p->length) * (p->breadth) << endl;
+    return 0;
+}

Structures/pointer.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int a = 10;
+    // declare a pointer to store address of a
+    int *p; // declaration
+    p = &a; // initialization
+    cout << "Adress of var a: " << p << endl;
+    cout << "Value of var a accessed by pointer(derefrencing): " << *p << endl;
+
+    return 0;
+}

Structures/pointertostruc.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+struct Rectangle
+{
+    /* data */
+    int length;
+    int breadth;
+};
+
+int main()
+{
+    struct Rectangle r = {10, 30};
+    // pointer to structure
+    struct Rectangle *p = &r;
+    cout << "value of length: " << (*p).length << endl;
+    cout << "value of breadth: " << (*p).breadth << endl;
+    cout << "Area: " << ((*p).length) * ((*p).breadth) << endl;
+
+    return 0;
+}

Structures/refrence.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int a = 10;
+    int &r = a; // data having two names orignal and a nickname
+    cout << "value of r: " << r << endl;
+    cout << "value of a: " << a;
+}

Structures/structure.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+// structure define
+struct Rectangle
+{
+    int length;
+    int breadth;
+};
+int main()
+{
+    struct Rectangle r;
+    r.length = 10;
+    r.breadth = 20;
+    cout << "Area of Rectangle: " << (r.length) * (r.breadth);
+    return 0;
+}