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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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Print Prime Numbers up to a Limit in C

Prime Numbers from 1 to N in C

✅ C Program to Print Prime Numbers from 1 to N

#include <stdio.h>

int main() {
    int n, i, j, count;

    printf("Enter the ending value: ");
    scanf("%d", &n);

    printf("Prime numbers from 1 to %d are:\n", n);
    for(i = 2; i <= n; i++) {
        count = 0;
        for(j = 1; j <= i; j++) {
            if(i % j == 0) {
                count++;
            }
        }
        if(count == 2) {
            printf("%d ", i);
        }
    }

    return 0;
}

🧠 Explanation:

  • The program takes user input n and prints all prime numbers from 1 to n.
  • It checks each number i from 2 to n.
  • For each i, it counts how many numbers divide it (using variable count).
  • If a number has exactly 2 factors (1 and itself), it is prime and printed.

🖥️ Sample Output:

Enter the ending value: 15
Prime numbers from 1 to 15 are:
2 3 5 7 11 13

🔑 Keywords:

Prime number program in C, C program using nested loops, check prime in C, number logic programs, beginner-friendly C program, coding interview logic

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