View Compilation Error

0_0_8933581_8370.cpp: In function `int main()':
0_0_8933581_8370.cpp:8: error: `n' undeclared (first use this function)
0_0_8933581_8370.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8933581_8370.cpp:8: error: `m' undeclared (first use this function)
0_0_8933581_8370.cpp:10: error: `k' undeclared (first use this function)
0_0_8933581_8370.cpp:12: error: `r' undeclared (first use this function)
0_0_8933581_8370.cpp:13: error: `now' undeclared (first use this function)
0_0_8933581_8370.cpp:14: error: `a' undeclared (first use this function)
0_0_8933581_8370.cpp:22: error: `b' undeclared (first use this function)