View Compilation Error

0_0_4863702_12270.cpp: In function `void dp()':
0_0_4863702_12270.cpp:9: error: `N' undeclared (first use this function)
0_0_4863702_12270.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4863702_12270.cpp:12: error: pointer to a function used in arithmetic
0_0_4863702_12270.cpp:12: error: pointer to a function used in arithmetic
0_0_4863702_12270.cpp:12: error: assignment of read-only location
0_0_4863702_12270.cpp:12: error: cannot convert `int' to `void ()()' in assignment