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C Program to Solve Two Sum Using Brute Force (With Algorithm & Output)

 Introduction The Two Sum problem is a popular coding interview question where we must find two indices of an array whose values add up to a given target. This program demonstrates a simple brute-force solution in C using nested loops and dynamic memory allocation. Problem Statement Given an integer array and a target value, return the indices of the two numbers such that they add up to the target. Each input has exactly one solution, and the same element cannot be used twice. The result should return the indices, not the values. If no solution exists, return NULL.  Algorithm / Logic Explanation Start the program. Traverse the array using a loop from index 0 to numsSize - 1 . Inside this loop, use another loop starting from i + 1 to numsSize - 1 . For every pair (i, j) , check if nums[i] + nums[j] == target . If condition becomes true: Allocate memory for 2 integers using malloc() . Store indices i and j . Set returnSize = 2 . Return the result poi...
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C Program to Convert Hexadecimal to Binary

C Program to Convert Hexadecimal to Binary

✅ C Program to Convert Hexadecimal to Binary (Using Bitwise Operators)

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

    printf("Binary: ");
    for (int i = 31; i >= 0; i--) {
        int bit = (num >> i) & 1;
        printf("%d", bit);
    }
    printf("\n");
    return 0;
}

📘 Explanation:

This program converts a hexadecimal number into its binary form using bitwise operators.

  • scanf("%x", &num) → directly reads a hexadecimal number into an integer.
  • (num >> i) & 1 → extracts the i-th bit from the number.
  • Loop runs from bit 31 to 0 → prints all 32 bits (full binary representation).
  • Output shows the binary form padded to 32 bits.

🧾 Sample Output:

Enter a hexadecimal number: 1A
Binary: 00000000000000000000000000011010

Enter a hexadecimal number: FF
Binary: 00000000000000000000000011111111

🔑 Keywords:

C program hex to binary, hexadecimal to binary conversion, bitwise operators in C, scanf %x example, binary representation in C

📌 Hashtags:

#CProgramming #HexToBinary #BitwiseOperators #CodingForBeginners #InterviewQuestions

🔍 Search Description:

This C program converts hexadecimal to binary using bitwise operators. It reads hex with %x and prints the 32-bit binary representation.

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