text: // Copyright (c) 2020, devgo.club
  // All rights reserved.
  
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  #define PI 3.1415926
  int64_t const MAX = 1 << 10;
  int64_t num = 0;
  
  int main(int argc, char const *argv[])
  {
      printf("PI = %f\n", PI);
      printf("MAX = %ld\n", MAX);
      printf("num = %ld\n", num);
      // ++MAX; // error: increment of read-only variable 'MAX'
      ++num;
      printf("num = %ld\n", num);
      return EXIT_SUCCESS;
  }