View Compilation Error

0_0_15764991_3955.c: In function 'main':
0_0_15764991_3955.c:28:11: error: expected expression before '/' token
           //printf("s1=%f\n",s);
           ^
0_0_15764991_3955.c:41:11: error: expected expression before '/' token
           //printf("s2=%f\n",s);
           ^
0_0_15764991_3955.c:54:11: error: expected expression before '/' token
           //printf("s3=%f\n",s);
           ^
0_0_15764991_3955.c:68:10: error: expected expression before '/' token
          // printf("s4=%f\n",s);
          ^