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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 Descending Number Pattern Using Loops

Descending Number Pattern in C

Descending Number Pattern in C

This C program prints a number pattern where each row contains numbers in ascending order, but the total number of elements decreases with each row. This is done using nested for loops.

✅ C Program Code:


#include <stdio.h>

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

💡 Explanation:

  • User Input: The program asks for a number (e.g., 5).
  • Outer Loop: Runs from the input number down to 1.
  • Inner Loop: Prints numbers from 1 to the current value of i.

💻 Sample Output:

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

🔍 Keywords:

C pattern program, descending number pattern in C, reverse triangle pattern C, number logic in C, beginner friendly C programs, nested loop patterns

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