View Compilation Error

0_0_12698643_28625.cpp: In function `int main()':
0_0_12698643_28625.cpp:3: error: `m' undeclared (first use this function)
0_0_12698643_28625.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12698643_28625.cpp:3: error: `n' undeclared (first use this function)
0_0_12698643_28625.cpp:11: error: `s' undeclared (first use this function)
0_0_12698643_28625.cpp:19: error: `d' undeclared (first use this function)