#include <stdio.h>
#include <stdint.h>

int* foo();
int bar();

int main(){
  int64_t* ptr = foo();
  int x = bar(2) 
  printf("%d\n", *ptr);
}


int64_t* foo(){
  int64_t x = 333;
  x += bar(x);
  return &x;
  //     ^^
  // Note that gcc is smart enough to realize this results
  // in undefined behaviour, and will return NULL
  // to try and have you "fail fast". Note that gcc won't catch
  // all of the cases where you use a pointer to a local variable
}

int64_t bar(int64_t param){
  return (param * 2);
}