/in/foo.cc: In function 'int main()':
/in/foo.cc:90:19: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%d ",x);
                   ^
/in/foo.cc:90:11: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d ",x);
     ~~~~~~^~~~~~~~~
/in/foo.cc:48:14: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
    long long y2=x-y1;
              ^~