View Compilation Error

0_0_27367126_30005.cpp: In function 'int main()':
0_0_27367126_30005.cpp:6:2: error: 'nbsp' was not declared in this scope
     int n,r;
  ^
0_0_27367126_30005.cpp: In function 'void f(int, int)':
0_0_27367126_30005.cpp:17:2: error: 'nbsp' was not declared in this scope
     if(n==0)
  ^
0_0_27367126_30005.cpp:19:20: error: 'else' without a previous 'if'
     else
                    ^