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C Program to Check Prime Number Using Efficient Logic

  Introduction A prime number is a number that has exactly two distinct positive divisors: 1 and itself. In this program, we check whether a given number is prime or not using a simple and efficient logic. This type of program is commonly used in mathematics, competitive programming, and basic algorithm learning for beginners in C programming. Problem Statement The task is to write a C program that determines whether a given integer is a prime number or not. The program takes a single integer input from the user and analyzes its divisibility. If the number has no divisors other than 1 and itself, it should be identified as a prime number; otherwise, it is not prime. This problem is important in number theory and has practical relevance in areas such as cryptography, data validation, and algorithm design.  Algorithm / Logic Explanation To check whether a number is prime, we need to verify that it is not divisible by any number other than 1 and itself. The algorithm follows a si...
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C Pattern Program: Diagonal Number Pattern

C Pattern Program: Diagonal Number Pattern

🔷 C Pattern Program: Diagonal Number Pattern

#include <stdio.h>

int main()
{
    int num;
    printf("Enter the number:\n");
    scanf("%d", &num);
    
    for (int i = 0; i < num; i++)
    {
        for (int j = 0; j < num; j++)
        {
            if (j == i)
                printf("%d", i + 1);
            else if (j == num - 1 - i)
                printf("%d", num - i);
            else
                printf(" ");
        }
        printf("\n");
    }

    return 0;
}

📘 Explanation:

This C program prints a square pattern with two diagonal lines:

🔹 On the **main diagonal** (from top-left to bottom-right), it prints i+1 (increasing number).
🔹 On the **anti-diagonal** (from top-right to bottom-left), it prints num - i (decreasing number).
🔹 All other positions are filled with spaces to maintain the structure.
🔹 The result is a visually symmetric pattern based on the input size.

🔍 Sample Output:

Enter the number:
5
1   5
 2 4 
  3  
 2 4 
1   5

🏷️ Keywords:

C pattern printing, diagonal number pattern, matrix pattern in C, double diagonal number pattern, C loop-based programs

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