View Compilation Error

451352_0_0_25304.cpp: In function `int main()':
451352_0_0_25304.cpp:38: error: `N' undeclared (first use this function)
451352_0_0_25304.cpp:38: error: (Each undeclared identifier is reported only once for each function it appears in.)
451352_0_0_25304.cpp:40: error: `scanf' undeclared (first use this function)
451352_0_0_25304.cpp:48: error: `a' undeclared (first use this function)
451352_0_0_25304.cpp:52: error: `printf' undeclared (first use this function)