// myarray.c

#include <stdio.h>
#include <stdlib.h>

typedef struct _myarray *myarray;
struct _myarray {
    int size;   // how big the array is
    int* data;  // pointer to the array
};

// example of a function declaration
int f(int x){
    return 2*x;
}

// create a new myarray 
myarray new_myarray(){
    int i;
    myarray newarray = malloc(sizeof(struct _myarray));
    newarray->size = 100;  // default size
    newarray->data = malloc(100 * sizeof(int));
    for (i=0; i<100; i++){
        newarray->data[i] = 0;
    }
    return newarray;
}

// get one element of the array
int get(int i, myarray ma){
    return ma->data[i];
}

// set one element of the array
void set(int i, int value, myarray ma){
    ma->data[i] = value;
}

int main(){
    myarray george = new_myarray();
    set(3, 20, george);   // set i=3 to value 20
    set(5, 30, george);   // set i=5 to value 30
    printf(" get(3, george) is %d \n", get(3, george));
    printf(" get(5, george) is %d \n", get(5, george));
    return 0;
}