“String subscript out of range” error when changing from character array to string?

Question

I\'m starting to use strings in place of character arrays and am encountering an error when I change one of my character arrays defined with a size of 5 to a string. The err

Answer 1

The error is because newWord[k] = word[i+k]; does not allocate a space for the string in newWord. The string length is 0, and it is undefined behaviour to do this. Use .append instead.

From cplusplus.com:

If pos is not greater than the string length, the function never throws exceptions (no-throw guarantee).Otherwise, it causes undefined behavior.

In the case of newWord[k], pos is k.

This is easy to avoid by using the append function in the string lib.

From cplusplus.com, again:

string& append (const string& str); //Appends a copy of str.

Answer 2

newWord[k]

The size of the newWord string is zero. The behavior of indexing beyond the end of a std::string is not defined.

You may need to resize the string, thus:

newWord.resize(5);