View Compilation Error

0_0_35642973_20192.c: In function 'main':
0_0_35642973_20192.c:21:5: error: expected expression before '/' token
     //printf("input:%d",a);
     ^
0_0_35642973_20192.c:25:3: error: expected expression before '/' token
   //printf("input end\n");
   ^
0_0_35642973_20192.c:28:5: error: expected expression before '/' token
     //printf("%d\n",j);
     ^