Question

Given a string userstring, a character newchar, and an integer strindex, how can we change the character at index strindex of userstring to newchar?

Answer 1

To change a character at a specific index in a string, you need to create a new string that incorporates the desired change because strings are immutable. This is done by concatenating parts of the original string and the new character at the correct position.

Step-by-step explanation:

To change the character at a specific index in a string named userstring to a character named newchar, using an integer named strindex, you have to create a new string with the desired change because strings in many programming languages are immutable. Here is a step-by-step explanation on how to perform this operation:

1. Check if strindex is within the range of userstring. It should be between 0 and one less than the length of the string, inclusive.
2. Create a new string up to, but not including, the index strindex.
3. Add the newchar to this new string.
4. Add the part of userstring that comes after strindex to the new string.

In code, this can often be done using slicing and concatenation. For a programming language like Python, the code snippet would look like:

userstring = userstring[:strindex] + newchar + userstring[strindex+1:]

Now, userstring would have the character at the index strindex replaced with newchar.