text: #include <math.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  static const int val1 = -5;
  const int val2 = 10;
  static int val3 = -20;
  int val4 = -15;
  extern int errno;
  
  static int add_abs(const int v1, const int v2) {
    return abs(v1) + abs(v2);
  }
  
  int main() {
    int val5 = 20;
    printf("%d / %d / %d / %d\n", add_abs(val1, val2), add_abs(val3, val4),
           add_abs(val1, val5), errno);
    return 0;
  }
  