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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 Decimal to Binary

C Program to Convert Decimal to Binary

✅ C Program to Convert Decimal Number to Binary

#include <stdio.h>

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

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

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

    while (num > 0) {
        binary[i] = num % 2;   // store remainder (0 or 1)
        num = num / 2;         // reduce number
        i++;
    }

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

    return 0;
}

📘 Explanation:

This C program converts a decimal number into its binary representation:

  • We repeatedly divide the number by 2 and store the remainders (0 or 1).
  • These remainders are stored in an array.
  • Finally, we print the array in reverse order to get the correct binary format.
  • If the number is 0, the output is directly 0.

🧾 Sample Output:

Enter a decimal number: 10
Binary: 1010

Enter a decimal number: 25
Binary: 11001

🔑 Keywords:

C program decimal to binary, decimal to binary conversion, division by 2 method in C, binary number C program, beginner C examples

📌 Hashtags:

#CProgramming #BinaryConversion #DecimalToBinary #CExamples #CodingForBeginners

🔍 Search Description:

This C program converts a decimal number into binary using division by 2 method. It stores remainders in an array and prints them in reverse order with example outputs.

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