View Compilation Error

40666_0_25491.cpp: In function `int main()':
40666_0_25491.cpp:6: error: `n' undeclared (first use this function)
40666_0_25491.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
40666_0_25491.cpp:7: error: `i' undeclared (first use this function)