/in/foo.cc: In function 'void str(double)':
/in/foo.cc:18:12: warning: unused variable 't' [-Wunused-variable]
   18 |     double t = n;
      |            ^
/in/foo.cc: In function 'int gys(int, int)':
/in/foo.cc:12:12: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 |     return c;
      |            ^
/in/foo.cc: In function 'void str(double)':
/in/foo.cc:33:57: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |     cout << numerator / divisor << '/' << denominator / divisor << endl;
      |                                                         ^~~~~~~