View Compilation Error

156930_0_14199.cpp: In function `int main()':
156930_0_14199.cpp:7: error: `n' undeclared (first use this function)
156930_0_14199.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
156930_0_14199.cpp:7: error: `m' undeclared (first use this function)