foo.cc: In function 'int main()':
foo.cc:41:10: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(flag=0)
      ~~~~^~
foo.cc:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%s%s%d",&sr[i].id,sr[i].name,sr[i].phone,&sr[i].secs);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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