Basic pointers in C

c_pointers

/*
 * main.c
 *
 *  Created on: May 13, 2015
 *      Author: Darko Demic
 */
#include <stdio.h>
//Testing pointers

/* a copy of the int n can be changed within the function without affecting the calling code */
void passByValue(int n) {
    n += 12;
    printf("The value of x was passed to subprogram and added to value of n and should be 15: %d\n", n);
}

/* a pointer to m is passed instead. No copy of m itself is created */
void passByAddress(int *m) {
    *m = 14;
}
void array_fill(int *ap){
	int i;
	for(i = 0; i < 5; i++){
		printf("Insert %d. unit of the array: ", i+1);
		scanf("%d",&ap[i]);
	}

}

int main(void) {
    int x = 3;

    /* pass a copy of x's value as the argument */
    passByValue(x);
    // the value was changed inside the function, but x is still 3 from here on
    printf("passed by value x is not changes and is equal to: %d\n", x);
    /* pass x's address as the argument */
    passByAddress(&x);
    // x was actually changed by the function and is now equal to 14 here
    printf("here x was passed by address or rather x's address was passed to subprogram. and now we can change X to be: %d\n",x);
    puts("");
    int array[5];
    int *arp = array;
    //sending arrays location to subfunction
    array_fill(arp);
    //Printing array that we filled with numbers
    puts("");
    printf("Your array looks like: \n");
    int i;
    for(i = 1; i <= 5; i++){
    	printf("%d. Memeber of the array is: %d \n",i, array[i-1]);
    }
    return 0;
}