foo.cc: In function 'int main()':
foo.cc:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |  scanf("%d/%d",&a1,&b1); //a1/b1
      |  ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:12:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |  scanf("%d/%d",&a2,&b2); //a2/b2
      |  ~~~~~^~~~~~~~~~~~~~~~~

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