View Compilation Error

0_0_36444386_21659.cpp:15:3: error: stray '\' in program
   for (i = 1; i < ls; i++) b[i] = (a[i] - a[i - 1] + 8) \% 8 + '0';
   ^
0_0_36444386_21659.cpp:16:3: error: stray '\' in program
   b[0] = (a[0] - a[ls - 1] + 8) \% 8 + '0';
   ^
0_0_36444386_21659.cpp: In function 'int main()':
0_0_36444386_21659.cpp:18:30: error: 'minRepresentation' was not declared in this scope
   t = minRepresentation(b, ls);
                              ^