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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 Convert Decimal to Octal

C Program to Convert Decimal to Octal

✅ C Program to Convert Decimal Number to Octal

#include <stdio.h>

int main() {
    int num, octal[32], i = 0;

    printf("Enter a decimal number: ");
    scanf("%d", &num);

    if (num == 0) {
        printf("Octal: 0\n");
        return 0;
    }

    while (num > 0) {
        octal[i] = num % 8;   // store remainder (0–7)
        num = num / 8;        // reduce number
        i++;
    }

    printf("Octal: ");
    for (int j = i - 1; j >= 0; j--) {  // print in reverse
        printf("%d", octal[j]);
    }
    printf("\n");

    return 0;
}

📘 Explanation:

This program converts a decimal number into its octal representation:

  • We repeatedly divide the number by 8 and store the remainders (0–7).
  • These remainders are stored in an array.
  • Finally, we print the array in reverse order to get the correct octal format.
  • If the number is 0, the output is directly 0.

🧾 Sample Output:

Enter a decimal number: 10
Octal: 12

Enter a decimal number: 25
Octal: 31

🔑 Keywords:

C program decimal to octal, decimal to octal conversion, division by 8 method in C, octal number C program, beginner C examples

📌 Hashtags:

#CProgramming #OctalConversion #DecimalToOctal #CExamples #CodingForBeginners

🔍 Search Description:

This C program converts a decimal number into octal using division by 8 method. It stores remainders in an array and prints them in reverse order with example outputs.

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