foo.cc: In function 'int main()':
foo.cc:13:19: warning: format '%ld' expects argument of type 'long int*', but argument 2 has type 'long long int*' [-Wformat=]
     scanf("%ld",&x);cout<<a[100+1]<<endl;
                 ~~^
foo.cc:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%ld",&x);cout<<a[100+1]<<endl;
     ~~~~~^~~~~~~~~~

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