foo.cc: In function 'int main()':
foo.cc:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
foo.cc:34:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf",&Eu);
     ~~~~~^~~~~~~~~~~
foo.cc:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lf%lf%lf",&s[i],&k[i],&u[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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