foo.cc: In function 'int main()':
foo.cc:24:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d%s%s%d",&rec[i].id,rec[i].name,rec[i].phone,&rec[i].secs);
      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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