View Compilation Error

0_0_12180612_11304.cpp: In function `matrix operator*(matrix, matrix)':
0_0_12180612_11304.cpp:27: error: `n' undeclared (first use this function)
0_0_12180612_11304.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12180612_11304.cpp: In function `matrix operator^(matrix, int)':
0_0_12180612_11304.cpp:44: error: `Mat' undeclared (first use this function)
0_0_12180612_11304.cpp:44: error: expected `;' before "c"
0_0_12180612_11304.cpp:46: error: `n' undeclared (first use this function)
0_0_12180612_11304.cpp:48: error: `c' undeclared (first use this function)