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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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Double-Sided Number Pyramid in C

Full Diamond Number Pattern in C

Full Diamond Number Pattern in C

This C program prints a full diamond-like number pattern using nested for loops. It starts by printing numbers in increasing order and then prints them in decreasing order to form a symmetric structure.

✅ C Program Code:


#include <stdio.h>

int main()
{
    int num;
    printf("Enter the number:\n");
    scanf("%d", &num);

    // Top half
    for (int i = 1; i <= num; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            printf("%d ", j);
        }
        printf("\n");
    }

    // Bottom half
    for (int i = num; i >= 1; i--)
    {
        for (int j = 1; j <= i; j++)
        {
            printf("%d ", j);
        }
        printf("\n");
    }
}

💡 Explanation:

  • The first for loop builds the upper part of the diamond using increasing rows.
  • The second for loop mirrors the top by printing decreasing rows.
  • Each row prints numbers from 1 up to the current row index.

💻 Sample Output:

Enter the number:
3
1
1 2
1 2 3
1 2 3
1 2
1

🔍 Keywords:

Diamond number pattern in C, number pyramid in C, full pyramid C pattern, nested loops example in C, beginner pattern programs, mirror pyramid C

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