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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 find the second largest element in an array using simple iteration

Second Largest Element in Array - C Program

🔍 Find Second Largest Element in Array (C Program)

#include<stdio.h>

int main()
{
    int num, a[100];
    printf("Enter the size of the array:\n");
    scanf("%d", &num);

    if (num < 2)
    {
        printf("Invalid input! At least two elements are required to find the second largest element.\n");
        return 1;
    }

    printf("Enter %d elements:\n", num);
    for (int i = 0; i < num; i++)
    {
        scanf("%d", &a[i]);
    }

    int first, second;

    if (a[0] > a[1])
    {
        first = a[0];
        second = a[1];
    }
    else
    {
        first = a[1];
        second = a[0];
    }

    for (int i = 2; i < num; i++)
    {
        if (a[i] > first)
        {
            second = first;
            first = a[i];
        }
        else if (a[i] > second && a[i] != first)
        {
            second = a[i];
        }
    }

    if (first == second)
    {
        printf("All elements are equal.\n");
    }
    else
    {
        printf("The second largest element in the array is %d\n", second);
    }

    return 0;
}

📘 Explanation:

🔹 The program accepts the size and values of an array.
🔹 It compares the first two elements to initialize `first` and `second`.
🔹 Then, for the rest of the array, it updates these values accordingly:
    – If a new maximum is found, the old maximum becomes second.
    – If it's between first and second and not equal to first, update second.
🔹 If all elements are the same, a message is displayed.

🧪 Sample Output:

Enter the size of the array:
6
Enter 6 elements:
21 45 78 64 90 55
The second largest element in the array is 78

🏷️ Keywords:

second largest element in array C, C array comparison, beginner C program, max two values in array, C programming array logic

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