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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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Print Prime Numbers up to a Limit in C

Prime Numbers from 1 to N in C

✅ C Program to Print Prime Numbers from 1 to N

#include <stdio.h>

int main() {
    int n, i, j, count;

    printf("Enter the ending value: ");
    scanf("%d", &n);

    printf("Prime numbers from 1 to %d are:\n", n);
    for(i = 2; i <= n; i++) {
        count = 0;
        for(j = 1; j <= i; j++) {
            if(i % j == 0) {
                count++;
            }
        }
        if(count == 2) {
            printf("%d ", i);
        }
    }

    return 0;
}

🧠 Explanation:

  • The program takes user input n and prints all prime numbers from 1 to n.
  • It checks each number i from 2 to n.
  • For each i, it counts how many numbers divide it (using variable count).
  • If a number has exactly 2 factors (1 and itself), it is prime and printed.

🖥️ Sample Output:

Enter the ending value: 15
Prime numbers from 1 to 15 are:
2 3 5 7 11 13

🔑 Keywords:

Prime number program in C, C program using nested loops, check prime in C, number logic programs, beginner-friendly C program, coding interview logic

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