This is a sample C program. It proves what happens when referencing the memory address of a stack variable declared inside a function

p.c

/*

# This is a sample C program
# It proves what happens when referencing the 
# memory address of a stack variable declared inside a function

# compile and run the program
gcc -o program1 p.c && ./program1

*/

#include <stdio.h>

int* f1(){
  int r = 10;
  return &r;
}

int main(){
  int* p = f1();

  printf("Value: %d \n", *p);
  return 0;
}