View Compilation Error

0_0_9146435_25584.cpp: In function `double mfmc()':
0_0_9146435_25584.cpp:49: error: `i' undeclared (first use this function)
0_0_9146435_25584.cpp:49: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9146435_25584.cpp:71: error: `from' has not been declared
0_0_9146435_25584.cpp:71: error: request for member of non-aggregate type before ';' token
0_0_9146435_25584.cpp: In function `int main()':
0_0_9146435_25584.cpp:100: error: `tinf' undeclared (first use this function)
0_0_9146435_25584.cpp:104: error: `w' undeclared (first use this function)