C++ string

1 Basic usage

(1) Header file #include

(2) Direct assignment, string str;str="Hello my dear";

Assign the character pointer to the string object: char ss[30] ="my name"; string str=ss;

(3) Append at the end: string str="hello"; str+='a';(Add character)str+="aa";(Add string);

str.append("aaa");(Method append)

(4) Insert characters: string str="12345";string::iterator it=str.begin();

str.insert(it+1, 'a');//Insert before the first element (starting from 0)

(5) Access: string str="1234";cout<

(6) Delete: string str="123456";string::iterator it=str.begin();str.erase(it);Delete '1'

str.erase(it+1,it+2);//Delete '3'

(7) length str. length(); Determine whether it is empty str.empty();

(8) Replacement: str.replace(i,len,"aaaa");//Starting from the i-th, replace len consecutive characters with "aaaa" ;There are 10 public

overloaded versions, which are the most commonly used.

(9) Search: int i=str.find("aaa"); Find the position of "aaa" in str. If not found, return string::npos;

(10) Compare str.compare("aaa "); If str<"aaa", return -1;

str=="aaa", return 0; str>"aaa", return 1

(11) Flip, add header file #include; reverse(str.begin(),str.end());

2 String and number conversion

If numbers are stored in string, each digit can be processed by traversing

for(i=0;i

For more related articles, please pay attention to the php Chinese website (www.php.cn)!