Which line in the following program will cause a compiler

Question

Which line in the following program will cause a compiler error?

1 #include
2 using namespace std;
3 
4 int main( )
5 {
6 int number = 5;
7 
8 if (number >= 0 && <= 100)
9 cout << "passed.n";
10 else
11 cout << "failed.n";
12 return 0;
13 }