foo.cc: In function 'int main()':
foo.cc:14:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 | while (scanf("%s",s1),s1[0]!='-')
      |        ~~~~~^~~~~~~~~
foo.cc:16:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 | scanf("%s",s2);
      | ~~~~~^~~~~~~~~

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