#include<stdio.h>

// Works in C
// In this version, we pass an address
void swap(int *a, int *b){
	int t = *a;
	*a = *b;
	*b = t;
}

// double_all:  Doubles everthing in an array of floats
// size_t is an integer that's the same size as a memory address
// It's unsigned
void double_all(double *arr, size_t item_count){
	for(int i = 0; i < item_count; i++)
		arr[i] *= 2;
}

// Indexing:
// arr[i] means *(arr + i)

int main(){
	int x = 24, y = 425;

	printf("x = %d\n", x);
	printf("y = %d\n", y);

	swap(&x, &y);
	printf("After Swap\n");
	printf("x = %d\n", x);
	printf("y = %d\n", y);

	double numbers[] = {3.14, 2.71, 5.14, 9.2, 4.1};
	double_all(numbers, 5);

	for(int i = 0; i < 5; i++)
		printf("%lf\n", *(numbers + i));
	

	return 0;
}