foo.cpp: In function 'int main()':
foo.cpp:10:16: error: 'scanf' was not declared in this scope
   scanf("%d",&n);
                ^
foo.cpp:18:16: error: 'printf' was not declared in this scope
      printf("-")
                ^
foo.cpp:25:19: error: 'printf' was not declared in this scope
         printf("x");
                   ^
foo.cpp:26:12: error: 'x' was not declared in this scope
         if(x>1)
            ^