View Compilation Error

51838_0_936.cpp: In function `int main()':
51838_0_936.cpp:4: error: `m' undeclared (first use this function)
51838_0_936.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
51838_0_936.cpp:4: error: `n' undeclared (first use this function)
51838_0_936.cpp:7: error: `return0' undeclared (first use this function)