View Compilation Error

0_0_33195995_19728.cpp: In function 'int main()':
0_0_33195995_19728.cpp:8:2: error: 'nbsp' was not declared in this scope
    b=f(a);
  ^
0_0_33195995_19728.cpp:11:2: error: 'nbsp' was not declared in this scope
    return 0;
  ^