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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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Dual Half Pyramid Star Pattern in C

Inverted and Upright Half Pyramid in C

Inverted and Upright Half Pyramid in C

This C program prints a symmetrical V-shaped pattern using asterisks (*). It first prints an inverted half pyramid followed by a normal half pyramid using nested for loops.

✅ C Program Code:


#include <stdio.h>

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

    // Inverted half pyramid
    for (int i = 1; i <= num; i++)
    {
        for (int j = i; j <= num; j++)
        {
            printf("* ");
        }
        printf("\n");
    }

    // Upright half pyramid
    for (int i = 1; i <= num; i++)
    {
        for (int j = i; j >= 1; j--)
        {
            printf("* ");
        }
        printf("\n");
    }
}

💡 Explanation:

  • The first loop prints the inverted half pyramid (top part) with decreasing number of stars.
  • The second loop prints the upright half pyramid (bottom part) with increasing number of stars.
  • This creates a V-shaped pattern using asterisks.

💻 Sample Output:

Enter the number:
4
* * * *
* * *
* *
*
*
* *
* * *
* * * *

🔍 Keywords:

Star pattern in C, V star pattern, inverted pyramid in C, C pattern practice, nested loops C programs, symmetric pattern using C

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