View Compilation Error

0_0_14877476_10039.c: In function 'main':
0_0_14877476_10039.c:18:9: error: expected expression before '/' token
         //diff = ((diff1 + diff2) % p + ((((len2 % p) * (num2 % p)) % p)* (num1 % p)) % p - ((sum2 % p)*(num1 %p)) % p + ((sum1 % p)*(num2 % p)) % p) % p;
         ^
0_0_14877476_10039.c:23:9: error: expected expression before '/' token
         //diffs[i-2] = diffs[i-1];
         ^
0_0_14877476_10039.c:28:9: error: expected expression before '/' token
         //diffs[i-1] = diffs[];
         ^