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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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Dual Half Pyramid Star Pattern in C

Inverted and Upright Half Pyramid in C

Inverted and Upright Half Pyramid in C

This C program prints a symmetrical V-shaped pattern using asterisks (*). It first prints an inverted half pyramid followed by a normal half pyramid using nested for loops.

✅ C Program Code:


#include <stdio.h>

int main()
{
    int num;
    printf("Enter the number:\n");
    scanf("%d", &num);

    // Inverted half pyramid
    for (int i = 1; i <= num; i++)
    {
        for (int j = i; j <= num; j++)
        {
            printf("* ");
        }
        printf("\n");
    }

    // Upright half pyramid
    for (int i = 1; i <= num; i++)
    {
        for (int j = i; j >= 1; j--)
        {
            printf("* ");
        }
        printf("\n");
    }
}

💡 Explanation:

  • The first loop prints the inverted half pyramid (top part) with decreasing number of stars.
  • The second loop prints the upright half pyramid (bottom part) with increasing number of stars.
  • This creates a V-shaped pattern using asterisks.

💻 Sample Output:

Enter the number:
4
* * * *
* * *
* *
*
*
* *
* * *
* * * *

🔍 Keywords:

Star pattern in C, V star pattern, inverted pyramid in C, C pattern practice, nested loops C programs, symmetric pattern using C

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