How To Think Like a Computer Scientist C++ Edition The Pretext Interactive Version

Way back in Subsection 1.4.2 I talked about run-time errors, which are errors that don’t appear until a program has started running.

So far, you probably haven’t seen many run-time errors, because we haven’t been doing many things that can cause one. Well, now we are. If you use the [] operator and you provide an index that is negative or greater than length-1, you will get a run-time error and a message something like this:

index out of range: 6, string: banana

Try it in your development environment and see how it looks.

int main() {
    string fruit = "apple";
    char letter = fruit[0];
    char letter = fruit[9];
    cout << fruit << endl;
    cout << fruit[-4] << endl;
    cout << fruit[4] << endl;
}

int main() {
 string sentence = "cat on the mat";
---
 sentence[4] = "i";
---
 sentence[5] = "i";  #distractor
---
 sentence[3] = "i";  #distractor
---
 sentence[11] = "h";
---
 sentence [12] = "h";  #distractor
---
 sentence[10] = "h"; #distractor
---
 cout << sentence << endl;
}