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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 check if a given string is a palindrome or not using a custom function

Palindrome Checker in C

🔁 Palindrome Check in C (Using Custom Function)

#include<stdio.h>
#include<string.h>

void pal(char str[])
{
    int left = 0, right = strlen(str) - 1;
    while (left < right)
    {
        if (str[left] != str[right])
        {
            printf("No, Entered string is not palindrome:\n");
            return;
        }
        left++;
        right--;
    }
    printf("Yes, Entered string is palindrome:\n");
}

int main()
{
    char str[100];
    printf("Enter the string:\n");
    scanf("%[^\n]", str);
    pal(str);
}

📘 Explanation:

🔹 The function `pal()` compares characters from the start and end moving toward the center.
🔹 If a mismatch is found, the string is not a palindrome.
🔹 The `scanf("%[^\n]", str)` reads a full line including spaces.
🔹 This logic is case-sensitive and does not ignore spaces or punctuation.

🧪 Sample Output:

Enter the string:
madam
Yes, Entered string is palindrome:

Enter the string:
hello
No, Entered string is not palindrome:

🏷️ Keywords:

C palindrome program, check palindrome in C, string comparison, string reverse logic, C interview program, custom function for palindrome check

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