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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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Check Palindrome and Reverse String in C

Check Palindrome and Reverse String in C

✅ Check Palindrome and Reverse a String in C

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

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

// Function to reverse the string
void reverse(char str[]) {
    int start = 0, end = strlen(str) - 1;
    while (start < end) {
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;
        start++;
        end--;
    }
}

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

    printf("Before Reversing: %s\\n", str);
    pal(str);              // Check palindrome before reversing
    reverse(str);
    printf("After Reversing: %s\\n", str);

    return 0;
}

📘 Explanation:

✅ This program reads a string from the user.
✅ It first checks whether the input string is a palindrome by comparing characters from both ends.
✅ If the string is not a palindrome, it notifies the user.
✅ Then it reverses the string using a two-pointer method and prints the reversed result.
✅ It uses strlen, scanf, and character swapping.

🧾 Sample Output:

Enter the string:
madam
Before Reversing: madam
Yes, Entered string is a palindrome.
After Reversing: madam

🔑 Keywords:

Palindrome check C, reverse string in C, C string programs, string palindrome logic, two pointer technique, string manipulation

📌 Hashtags:

#CProgramming #PalindromeCheck #ReverseString #StringHandling #BeginnersC #InterviewPrep #StringFunctions

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