View Compilation Error

195947_0_8872.cpp: In function `int main()':
195947_0_8872.cpp:10: error: `i' undeclared (first use this function)
195947_0_8872.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
195947_0_8872.cpp:12: error: `gm' undeclared (first use this function)