#include  <stdio.h>
#include  <string.h>
#include  <stdlib.h>

int main (int argc, char **argv)
{

  
  char buf[1000];

  int test_variable = 777;

  snprintf( buf, sizeof(buf), argv[1] ); //size check, correctly: snprintf( buf, sizeof(buf), "%s", argv[1] );

  printf("Buffer size is: (%zu)\nData input: %s \nMemory address for buf: (%p)\n\n", strlen(buf), buf, buf); //%zu - size_t 

  printf("test_variable equals: %d/ in hex: %#x\nMemory address for test_variable: (%p) \n", test_variable, test_variable, &test_variable);

  return 0;
}