View Compilation Error

0_0_20231662_26402.c: In function 'main':
0_0_20231662_26402.c:13:5: error: expected expression before '/' token
     //freopen("input.txt", "r", stdin);
     ^
0_0_20231662_26402.c:14:5: error: expected expression before '/' token
     //freopen("output.txt","w", stdout);
     ^
0_0_20231662_26402.c:16:5: error: expected expression before '/' token
     //while(getchar() != '\n') continue;
     ^