foo.cc: In function 'int zdgys(int, int)':
foo.cc:9:1: warning: control reaches end of non-void function [-Wreturn-type]
    9 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:13:23: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   13 |  int len=x.length(),y,z,
      |                       ^
foo.cc:13:21: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   13 |  int len=x.length(),y,z,
      |                     ^

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