View Compilation Error

0_0_38346939_18745.cpp: In function 'int main()':
0_0_38346939_18745.cpp:19:60: error: expected ']' before ')' token
                 &&a[i]>='A'||a[i]=='_'||a[i<='9'&&a[i]>='0') 
                                                            ^
0_0_38346939_18745.cpp:19:60: error: expected ']' before ')' token
0_0_38346939_18745.cpp:19:60: error: expected ']' before ')' token