/in/foo.cc: In function 'int main()':
/in/foo.cc:9:20: error: 'scan' was not declared in this scope
     scan("%d",&a[i]);
                    ^
/in/foo.cc:11:16: error: 'scan' was not declared in this scope
     scan("d",&b);
                ^
/in/foo.cc:13:9: error: 'i' was not declared in this scope
     for(i=0;i<=9;i++)
         ^