View Compilation Error

0_0_25325463_10798.c: In function 'main':
0_0_25325463_10798.c:5:5: error: expected expression before '/' token
     //freopen("in.txt","r",stdin);
     ^
0_0_25325463_10798.c:6:5: error: expected expression before '/' token
     //freopen("out.txt","w",stdout);
     ^