View Compilation Error

0_0_33167415_1663.c: In function 'main':
0_0_33167415_1663.c:13:68: error: expected expression before '/' token
    if(!(a[0]=='_'||(a[0]>='a'&&a[0]<='z')||(a[0]>='A'&&a[0]<='Z')))//gets()
                                                                    ^