/in/foo.cc: In function 'int main()':
/in/foo.cc:4:4: error: 'k' was not declared in this scope
 if(k==1)
    ^
/in/foo.cc:6:9: error: 'f' was not declared in this scope
         f[1]=0;
         ^
/in/foo.cc:7:13: error: 'i' was not declared in this scope
         For(i,2,n)
             ^
/in/foo.cc:7:17: error: 'n' was not declared in this scope
         For(i,2,n)
                 ^
/in/foo.cc:7:18: error: 'For' was not declared in this scope
         For(i,2,n)
                  ^