View Compilation Error

0_0_4824595_7198.cpp: In member function `matrix matrix::operator*(const matrix&)':
0_0_4824595_7198.cpp:12: error: `cnt' undeclared (first use this function)
0_0_4824595_7198.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4824595_7198.cpp: At global scope:
0_0_4824595_7198.cpp:21: error: `int cnt' used prior to declaration