/* PassingToFunctions.c
 * CS201 - by RA
 */

#define MY_MAX_ARRAY_SIZE 6

void foo1 (int x[MY_MAX_ARRAY_SIZE]); //sized array
void foo2 (int x[], int arrSize);   //unsized array
void foo3 (int *x, int arrSize);    //pointer
//int* foo4 (); // WRONG!!! WHY??? CAN YOU FIX IT?

#include <stdio.h>
int main(void)
{ 
typedef int myVector_t[4];
myVector_t a[3];
int b[3][4];
int myArray[MY_MAX_ARRAY_SIZE]; 
int i;

a[2][3]=7;
b[2][3]=7;

foo1(myArray);
for(i=0; i<MY_MAX_ARRAY_SIZE; i++)
printf("\nValue of myArray[%d]: %d", i, myArray[i]);
printf("\n");

foo2(myArray, MY_MAX_ARRAY_SIZE);
for(i=0; i<MY_MAX_ARRAY_SIZE; i++)
printf("\nValue of myArray[%d]: %d", i, myArray[i]);
printf("\n");

foo3(myArray, MY_MAX_ARRAY_SIZE);
for(i=0; i<MY_MAX_ARRAY_SIZE; i++)
printf("\nValue of myArray[%d]: %d", i, myArray[i]);
printf("\n");

/*
myArray=foo4();
for(i=0; i<MY_MAX_ARRAY_SIZE; i++)
printf("\nValue of myArray[%d]: %d", i, myArray[i]);
printf("\n");
*/

exit(0);
}

 void foo1 (int x[MY_MAX_ARRAY_SIZE]) //sized array
 {
 int i;
 for (i = 0; i < MY_MAX_ARRAY_SIZE; i++)
    x[i] = 1;
 }

 void foo2 (int x[], int arrSize)   //unsized array
 {
 int i;
 for (i = 0; i < arrSize; i++)
    x[i] = 2;
 }

 void foo3 (int *x, int arrSize)    //pointer
 {
 int * p;
// for (p = x; p < &x[arrSize]; p++)
// the same as:
// for (p = &x[0]; p < &x[arrSize]; p++)
// or, to be even more explicit
 for (p = &x[0]; p < x+arrSize*sizeof(int); p++)
    *p = 3;
 }


/*
 int* foo4 () 
 {
 int x[MY_MAX_ARRAY_SIZE]={4,4,4};
 return x;
 }
*/