View Compilation Error

0_0_8757325_32439.cpp: In function `int cmp(const void*, const void*)':
0_0_8757325_32439.cpp:5: error: `nbsp' undeclared (first use this function)
0_0_8757325_32439.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8757325_32439.cpp: In function `int main()':
0_0_8757325_32439.cpp:9: error: `nbsp' undeclared (first use this function)