View Compilation Error

0_0_13954848_3766.cpp: In function 'fsl operator+(const fsl&, const fsl&)':
0_0_13954848_3766.cpp:35:7: error: assignment of member 'fsl::fm' in read-only object
  q.fm /= x;
       ^
0_0_13954848_3766.cpp:36:7: error: assignment of member 'fsl::fm' in read-only object
  p.fm /= x;
       ^
0_0_13954848_3766.cpp: In function 'fsl operator-(const fsl&, const fsl&)':
0_0_13954848_3766.cpp:41:7: error: assignment of member 'fsl::fm' in read-only object
  q.fm /= x;
       ^
0_0_13954848_3766.cpp:42:7: error: assignment of member 'fsl::fm' in read-only object
  p.fm /= x;
       ^