View Compilation Error

0_0_18127858_14522.cpp: In function 'int guess(int)':
0_0_18127858_14522.cpp:36:31: error: 'y' was not declared in this scope
                 for(int l=j;l<y;l++) mad[k][l]=ax*mad[k][l]-bx*mad[i][l];
                               ^