View Compilation Error

0_0_8081103_27318.cpp:1: error: `N' was not declared in this scope
0_0_8081103_27318.cpp: In function `void f()':
0_0_8081103_27318.cpp:5: error: `N' undeclared (first use this function)
0_0_8081103_27318.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8081103_27318.cpp:7: error: `a' undeclared (first use this function)
0_0_8081103_27318.cpp: In function `int main()':
0_0_8081103_27318.cpp:13: error: `cin' undeclared (first use this function)
0_0_8081103_27318.cpp:16: error: `a' undeclared (first use this function)
0_0_8081103_27318.cpp:17: error: `cout' undeclared (first use this function)
0_0_8081103_27318.cpp:17: error: `endl' undeclared (first use this function)