View Compilation Error

0_0_37987631_26143.c: In function 'tan':
0_0_37987631_26143.c:10:13: error: invalid operands to binary % (have 'char *' and 'int')
         if(a%2)
             ^
0_0_37987631_26143.c:18:10: error: invalid operands to binary / (have 'char *' and 'int')
         a/=2;
          ^
0_0_37987631_26143.c: At top level:
0_0_37987631_26143.c:32:1: error: expected identifier or '(' before '/' token
 //
 ^