Which of the following expressions is legal? Treat the effect of these as non-cumulative.

Question

Suppose we have the following definition:
```
vector vec, vec1;
//use push_back to put 10 values into vec instead
vector::iterator p = vec.begin();
vector::const_iterator q = vec.begin();
```

a) *p = 1;
b) *q = 1;
c) p = vec.end ();
d) q = vec1.end();

Answer 1

All are legal except b).

Declaring q a const_iterator promises not to change the location in the vector that q points using q. The error message a compiler gives for part b) is
```
// *q = 1; error: l-value specifies a const object
```