Memory

• Exercise: Study the following code:

  #include <stdlib.h>
  #include <stdio.h>
  
  void foo();
  int *var;
  
  int main()
  {
    // Memory allocation for var
    var=(int*)malloc(sizeof(int)*4);
    
    // Set and display data
    var[0] = 4;
    printf("%d ", var[0]);
    
    // Free memory space of the pointers
    free(var);
    printf("%d ", var[0]);
    
    // Call a function for alloca()
    foo();
    //free(var);
    
    return 0;
  }
  
  void foo()
  {
    var=(int*)alloca(sizeof(int)*4);
    var[0] = 4;
  }
  

• Uncomment the free line after calling the foo() function and execute the code again. What happens?