View Compilation Error

0_0_9265715_4537.cpp: In function `int main()':
0_0_9265715_4537.cpp:8: error: `n' undeclared (first use this function)
0_0_9265715_4537.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9265715_4537.cpp:8: error: `m' undeclared (first use this function)