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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 Hexadecimal to Octal

C Program to Convert Hexadecimal to Octal

✅ C Program to Convert Hexadecimal to Octal

#include <stdio.h>
int main() {
    int num;
    printf("Enter a hexadecimal number: ");
    scanf("%x", &num);   // read hex input

    printf("Octal: %o\n", num);   // print in octal
    return 0;
}

📘 Explanation:

This program converts a hexadecimal number into its octal form.

  • scanf("%x", &num) → reads a number in hexadecimal format and stores it as an integer.
  • printf("%o", num) → prints the same number in octal format.
  • No manual conversion is needed — C automatically handles it using format specifiers.

🧾 Sample Output:

Enter a hexadecimal number: 1A
Octal: 32

Enter a hexadecimal number: FF
Octal: 377

🔑 Keywords:

C program hex to octal, hexadecimal to octal conversion, scanf %x example, printf %o example, number system conversion in C

📌 Hashtags:

#CProgramming #HexToOctal #CodingForBeginners #InterviewQuestions #LearnC

🔍 Search Description:

This C program converts a hexadecimal number to octal using scanf with %x and printf with %o format specifiers. Includes explanation and sample outputs.

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