View Compilation Error

0_0_25240416_3290.c: In function 'fun':
0_0_25240416_3290.c:10:10: error: expected expression before 'double'
  e+=(1.0/double(sum));
          ^
0_0_25240416_3290.c: In function 'main':
0_0_25240416_3290.c:19:1: error: expected expression before '/' token
 // printf("0 1\n");
 ^
0_0_25240416_3290.c:20:1: error: expected expression before '/' token
 // printf("1 2\n");
 ^
0_0_25240416_3290.c:21:1: error: expected expression before '/' token
 // printf("2 2.5\n");
 ^