Delete last 4 characters from a given string.

[Jahan1]

x="A4478596895";
delete last four characters.

[limweizhong]

For a C++ string class, use the erase and length function:

x.erase(x.length()-4);

This erase member takes the starting position (left-most) of the characters to remove, and takes in a second optional parameter which is the number of characters to remove. If the second parameter is not specified, all the characters from the starting position will be removed. (The erase thus shortens the string by the number of characters removed.)

Just for info, if your string is a C string, simply set the character after the last character to 0 (null terminate it):

x[strlen(x)-4]=0;

[limweizhong]

Hmm... it works right? I don't know who reset my answer.

Edit: I did test my solution before writing this post, and it works... It is, in my opinion, probably the most efficient one, because it does the operation directly on the string using a built-in C++ function without any loops.

[weaknessforcats]

The best approach is to iterate the string from right to left. Just use rbegin() an iterate 4 times doing and erase on each iteration. The string will slide to the right each time.

[javasuniltyata]

x = x.substring(0,x.length()-4);

[weaknessforcats]

That is even better.