View Compilation Error

0_0_15107039_30713.c: In function 'prime':
0_0_15107039_30713.c:9:2: error: stray '\243' in program
  for (i = 3; i <= sqrt(（double）(a)); i++)
  ^
0_0_15107039_30713.c:9:2: error: stray '\250' in program
0_0_15107039_30713.c:9:26: error: expected expression before 'double'
  for (i = 3; i <= sqrt(（double）(a)); i++)
                          ^
0_0_15107039_30713.c:9:26: error: stray '\243' in program
0_0_15107039_30713.c:9:26: error: stray '\251' in program