字符串 操作

先上代码：

ngnsvr9 [** NONE **]/home/xionghailong/c++/string $ cat string.cpp
#include <iostream>
#include <string>

using namespace std;

int main()
{
        string input;
        int i=0;
        int cat_find = 0;

        cout<< "please enter a line of text: ";
        getline( cin, input, '\n');//以换行符作为输入的结束，输入一行字符串
        cout << "you have typed in the line"<<'\n'<<input<<'\n';

        for (int i=0; i <input.length(); i++)
        {
                cout<< input[i] << '\n';// 字符串单个单个的打印
        }

        for(i = input.find("cat", 0); i != string::npos; i = input.find("cat", i) )// 查找字符串中是否有cat
        {
                cat_find++;
                i++;
        }

        cout << "the word cat find"<< cat_find<< "in the string"<<':'<<'\n'<<input<<'\n';
}

 

执行结果：

ngnsvr9 [** NONE **]/home/xionghailong/c++/string $ g++ string.cpp
ngnsvr9 [** NONE **]/home/xionghailong/c++/string $ ./a.out
please enter a line of text: there is a cat
you have typed in the line
there is a cat
t
h
e
r
e
 
i
s
 
a
 
c
a
t
the word cat find1in the string:
there is a cat

 

代码中包含啦一些字符串的操作的接口，在实际代码中很有帮助。