C++ How to copy text in string (from i.e. 8 letter to 12 letter)

This is not homework, I need this for my program :)

I ask this question, because I searched for this in Google about 1 hour, and I don't find anything ready to run. I know that is trivial question, but if you will help me, you will make my day :)

Question:

How to copy text in string (from for example 8 letter to 开发者_运维技巧12 letter) and send to other string?

I have string:

string s = "RunnersAreTheBestLovers";

and I want text from 8 letter to 17 letter in next string

Alice90

The string class has a substr method:

string t = s.substr(8, 9);

The first parameter is the starting index and the second parameter is the number of characters to extract.

I assume you're trying to get the 8th - 17th characters in a another string. If so you should use the substring method string::substr

string s = "RunnersAreTheBestLovers";
string other = s.substr(8, 9);

Check out the sections on copying and substrings:

http://www.cprogramming.com/tutorial/string.html

Take a look at the answers to this question.

// For fun...  Assuming 8 and 17 are index values, could be off by 1
// Treat s and a char[], C style.


char *nextStringPtr = nextString;
for(int i=8; i<17; i++)
{
    *nextStringPtr++ = s[i];
}
*nextStringPtr = 0;