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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 Reverse an Array

 

🔁 C Program to Reverse an Array

#include<stdio.h>
int main()
{
    int num, a[100];
    printf("Enter size of the array:\n");
    scanf("%d", &num);
    if(num <= 0)
    {
        printf("!invalid Array Size:\n");
        return 1;
    }
    printf("Enter %d elements:\n", num);
    for(int i = 0; i < num; i++)
    {
        scanf("%d", &a[i]);
    }
    printf("\nBefore reverse:\n");
    for(int i = 0; i < num; i++)
    {
        printf("%d ", a[i]);
    }
    printf("\nAfter reverse:\n");
    for(int i = num - 1; i >= 0; i--)
    {
        printf("%d ", a[i]);
    }
}

📝 Explanation:

This program takes an array of integers from the user, displays the original array, and then prints the elements in reverse order. It uses a loop to first store the input values, and then another loop from the end of the array to the beginning for reverse display.

💡 Sample Output:

Enter size of the array:
5
Enter 5 elements:
10 20 30 40 50

Before reverse:
10 20 30 40 50
After reverse:
50 40 30 20 10

🔍 Keywords:

Reverse array in C, C program for reverse, loop reverse logic, array operations in C, beginner array program

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