View Compilation Error

0_0_18603984_31440.c: In function 'main':
0_0_18603984_31440.c:30:3: error: expected expression before '/' token
   // freopen("in.txt","r",stdin);
   ^
0_0_18603984_31440.c:31:1: error: expected expression before '/' token
 // freopen("out1.txt","w",stdout);
 ^