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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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Write a program to count set bits in a number in c

Count Set Bits in an Integer - C Program

✅ Count Set Bits in an Integer - C Program

#include<stdio.h>

int set(int num)
{
    int count = 0;
    while(num)
    {
        count += num & 1;
        num >>= 1;
    }
    return count;
}

int main( )
{
    int num, result;
    printf("Enter the number:\n");
    scanf("%d", &num);
    result = set(num);
    printf("set bits in %d is %d\n", num, result);
}

📘 Explanation:

This program counts the number of set bits (i.e., bits that are 1) in a given integer.

  • It uses a while loop to iterate through each bit of the number.
  • The num & 1 checks if the least significant bit (LSB) is 1.
  • If it is, count is incremented.
  • Then the number is right-shifted by 1 using num >>= 1.
  • This continues until all bits are processed.

💻 Sample Output:

Enter the number:
13
set bits in 13 is 3

🔑 Keywords:

C program to count set bits, bitwise AND in C, count number of 1s in binary, bit manipulation, beginner level C programs, efficient bit counting

📌 Hashtags:

#CProgramming #SetBits #BitwiseOperators #InterviewC #CodeSnippet #TechBlog #BinaryInC #LearnToCode

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