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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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Typedef in C - Real World Examples

Typedef in C - Real World Examples

✅ Typedef in C - Real World Examples

🔹 Typedef with Pointers

#include <stdio.h>

typedef int* IntPtr;

int main() {
    int a = 100;
    IntPtr p = &a;
    printf("Value at pointer: %d\n", *p);
    return 0;
}

🔹 Typedef with Function Pointer

#include <stdio.h>

typedef void (*FuncPtr)(int);

void greet(int x) {
    printf("Hello %d times!\n", x);
}

int main() {
    FuncPtr fp = greet;
    fp(3);
    return 0;
}

🔹 Typedef with Enum

#include <stdio.h>

typedef enum {
    RED, GREEN, BLUE
} Color;

int main() {
    Color c = GREEN;
    printf("Color value: %d\n", c);
    return 0;
}

🔹 Typedef with Struct

#include <stdio.h>

typedef struct {
    int x, y;
} Point;

int main() {
    Point p1 = {10, 20};
    printf("x = %d, y = %d\n", p1.x, p1.y);
    return 0;
}

🔹 Typedef with Unsigned Int

#include <stdio.h>

typedef unsigned int unit;

int main() {
    unit a = 0;
    printf("The value of a is: %u", a);
}

🧠 Explanation:

  • typedef allows creating aliases for existing data types.
  • Improves readability especially for complex declarations like function pointers or structs.
  • Helpful in embedded systems, large codebases, and API headers.

🖥️ Sample Output:

Value at pointer: 100
Hello 3 times!
Color value: 1
x = 10, y = 20
The value of a is: 0

🔑 Keywords:

typedef in C, typedef with pointers, typedef with struct, typedef with enum, function pointer typedef, C programming tutorials, embedded C typedef

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