View Compilation Error

0_0_12044300_1097.cpp: In function `int main()':
0_0_12044300_1097.cpp:150: error: `n' undeclared (first use this function)
0_0_12044300_1097.cpp:150: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12044300_1097.cpp:154: error: `mod' undeclared (first use this function)