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Merge Sort in C++

  Merge Sort in C++ Introduction Merge Sort is a popular sorting algorithm that follows the Divide and Conquer approach. It divides an array into smaller subarrays, recursively sorts those subarrays, and finally merges the sorted subarrays to produce a completely sorted array. In this tutorial, we will learn how to implement Merge Sort in C++ . The program divides the array into two halves using the mid index, recursively sorts both halves, and then combines them using the merge() function. Merge Sort has a time complexity of O(n log n) in the best, average, and worst cases. Table of Contents Algorithm C++ Program Input Sample Output Output Explanation Dry Run Flow of Execution Time Complexity Space Complexity Applications Key Points Interview Questions Frequently Asked Questions Keywords Conclusion Algorithm Start the program. Read the size of the array. Read the array elements from the user. Call the mer...
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C Program for Referencing and Dereferencing (Pointers)

C Program for Referencing and Dereferencing (Pointers)

✅ C Program for Referencing and Dereferencing (Pointers)

#include<stdio.h>
int main()
{
    int x = 10;
    int *ptr = &x;   // Referencing = storing the address of variable 'x' into pointer 'ptr'.

    printf("%d", *ptr);  // Dereferencing = fetching the value stored at that address (here 10).
}

📘 Explanation:

Pointers in C are used to store the address of variables. - Referencing (&): The & operator is used to get the address of a variable. - Dereferencing (*): The * operator is used to fetch the value stored at that address.

In this program:

  • int *ptr = &x; → stores the address of x into pointer ptr.
  • *ptr → retrieves the value stored at that address (10).

🧾 Sample Output:

10

🔑 Keywords:

C pointers, referencing in C, dereferencing in C, pointer basics, beginner C programs, C interview questions on pointers

📌 Hashtags:

#CProgramming #Pointers #Referencing #Dereferencing #InterviewPrep

🔍 Search Description:

Simple C program to demonstrate referencing (&) and dereferencing (*) using pointers. Explains storing an address and accessing value with sample output.

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