View Compilation Error

0_0_22364562_5341.cpp: In member function 'int GAUSS_int_mod::Gauss(int, int)':
0_0_22364562_5341.cpp:29:9: error: expected initializer before 'memset'
         memset(x, 0, sizeof(int) * (var + 1));
         ^
0_0_22364562_5341.cpp:41:21: error: 'LCM' was not declared in this scope
                     LCM = lcm(abs(a[i][col]), abs(a[k][col]));
                     ^
0_0_22364562_5341.cpp:52:13: error: 'temp' was not declared in this scope
             temp = a[i][var];
             ^