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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 Program to Print Right-Aligned Triangle Number Pattern

🔺 C Program to Print Right-Aligned Number Triangle Pattern

#include <stdio.h>
int main( )
{
    int num;
    scanf("%d", &num);
    for(int i = 1; i <= num; i++)
    {
        for(int k = num; k >= i; k--)
        {
            printf(" ");
        }
        for(int j = 1; j <= i; j++)
        {
            printf("%d ", j);
        }
        printf("\n");
    }
}

📝 Explanation:

This program prints a right-aligned triangle of increasing numbers. Spaces are printed first, followed by numbers from 1 to i on each line.

💡 Sample Output (for input 5):

     1 
    1 2 
   1 2 3 
  1 2 3 4 
 1 2 3 4 5

🔍 Keywords:

C pattern programs, triangle pattern in C, right aligned triangle, beginner C exercises

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