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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 Decimal

C Program to Convert Hexadecimal to Decimal

✅ C Program to Convert Hexadecimal to Decimal

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

    printf("Decimal: %d\n", num);
    return 0;
}

📘 Explanation:

This program converts a hexadecimal number into its decimal form.

  • scanf("%x", &num) → reads a number in hexadecimal format and stores it in an integer.
  • printf("%d", num) → prints the decimal equivalent of the number.
  • No manual calculation is required since C handles the conversion automatically.

🧾 Sample Output:

Enter a hexadecimal number: 1A
Decimal: 26

Enter a hexadecimal number: FF
Decimal: 255

🔑 Keywords:

C program hex to decimal, hexadecimal to decimal conversion, scanf %x example, C programming basics, interview C programs

📌 Hashtags:

#CProgramming #HexToDecimal #CodingForBeginners #InterviewQuestions #LearnC

🔍 Search Description:

This C program converts a hexadecimal number to decimal using scanf with %x format specifier. Simple explanation with output examples.

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