CS 261 Week 3 Recitation Exercise

prog1.c

#include <stdlib.h>

int multiply_by_2(int* p) {
  *p = *p * 2;
  return *p;
}

int main() {
  int n = 10, x = 16, y = 32, z = 64;
  int* p1 = &x;
  int* a = malloc(n * sizeof(int));
  int* p2;

  for (int i = 0; i < n; i++) {
    a[i] = i;
  }

  p2 = a + (n / 2);
  *p2 = 0;

  z = multiply_by_2(&x);
  y = multiply_by_2(p1);
  free(a);
}

prog2.c

#include <stdlib.h>

struct product {
  char* name;
  float price;
};

struct product* create_product(char* name, float price) {
  struct product* p = malloc(sizeof(struct product));
  p->name = malloc((1 + strlen(name)) * sizeof(char));
  strcpy(p->name, name);
  p->price = price;
  return p;
}

int main() {
  int i, n = 5;
  struct product** products = malloc(n * sizeof(struct product*));
  
  for (i = 0; i < n; i++) {
    products[i] = create_product("A product name", 32.99);
  }
  
  for (i = 0; i < n; i++) {
    free(products[i]);
  }
  free(products);
}