// Pantea Aria

// pointers

// Write a program that:
// Defines an integer variable in main.
// uses function square_number to square the value (multiply it by itself)
// Print the result in main.


#include <stdio.h>
void square_number (int *pointer);
int main() {
    
    int number = 100;
    printf("number before function is %d\n", number);

    // call function square_number
    square_number(&number);

    printf("number after function is %d\n", number);

    return 0;
}
void square_number(int *p) {
  *p = *p * (*p);
}
 
  // referncing means, getting the address of a variable
  //derefrencing means getting the value stored in an address