Write a function numLines that takes as a parameter an open input stream referencing a text file and returns as the function value the number of lines of text in the file. You may assume that the last character in the file is the newline character.

What will be an ideal response?

```
int numLines( ifstream& inf )
{
int lines = 0;
string oneLine;
for (getline( inf, oneLine ); !inf.fail(); getline( inf, oneLine ))
++lines;
return lines;
}
```