额外的string操作

<span style="font-weight: normal;">string name("AnnaBelle");
auto pos1=name.find("Anna");    //pos1==0</span>

string numbers("0123456789"), name("r2d2");
//返回1，即，name中第一个数字的下标
auto pos=name.find_first_of(numbers);

string dept("03714p3");
//返回5--字符'p'下标
auto pos=dept.find_first_not_of(numbers);

string::size_type pos=0;
//每步循环查找name中下一个数
while((pos=name.find_first_of(numbers, pos)) != string::npos)
{
    cout<<"found number at index: "<<pos
        <<" element is "<<name[pos]<<endl;
    
    ++pos;
}

#include<iostream>
#include<string>

using namespace std;

int main()
{
    string s1="ab2c3d7R4E6",s2="abcdRE",s3="23467";
    string::size_type pos=0;
    cout<<"使用find_first_of查找！！！"<<endl;
    //在s2中第pos个位置开始找，找到第一个存在于s1中的元素位置
    while((pos=s1.find_first_of(s3, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"数字 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<">--------------------------------------<"<<endl;

    pos=0;
    while((pos=s1.find_first_of(s2, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"字符 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<"使用find_first_not_of查找！！！"<<endl;
    pos=0;
    while((pos=s1.find_first_not_of(s2, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"数字 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<">--------------------------------------<"<<endl;

    pos=0;
    while((pos=s1.find_first_not_of(s3, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"字符 element is "<<s1[pos]<<endl;

        ++pos;
    }

    return 0;
}

/**
* 功能:额外的string操作
* 时间:2014年6月13日08:07:58
* 作者:cutter_point
*/

#include<iostream>
#include<string>

using namespace std;

int main()
{
    string s1="ab2c3d7R4E6",s2="abcdRE",s3="23467";
    string::size_type pos=0;
    cout<<"使用find_first_of查找！！！"<<endl;
    //在s2中第pos个位置开始找，找到第一个存在于s1中的元素位置
    while((pos=s1.find_first_of(s3, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"数字 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<">--------------------------------------<"<<endl;

    pos=0;
    while((pos=s1.find_first_of(s2, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"字符 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<"使用find_first_not_of查找！！！"<<endl;
    pos=0;
    while((pos=s1.find_first_not_of(s2, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"数字 element is "<<s1[pos]<<endl;

        ++pos;
    }

    cout<<">--------------------------------------<"<<endl;

    pos=0;
    while((pos=s1.find_first_not_of(s3, pos)) != string::npos)
    {
        cout<<"found number at index: "<<pos
        <<"字符 element is "<<s1[pos]<<endl;

        ++pos;
    }

    return 0;
}


/*
//n, len2, pos2 都是无符号值
string s(cp, n)     //s是cp指向的数组中前n个字符的拷贝。此数组至少应该包含n个字符
string s(s2, pos2)  //s是string s2从下标pos2开始的字符的拷贝。
string s(s2, pos2, len2)    //s是s2从pos2开始Len2个字符

const char *cp="Hello World!!!";    //以空字符结束的数组
char noNull[]={'H', 'i'};           //不是以空字符结束
string s1(cp);          //拷贝cp中的字符，直到遇到空字符；s1==“Hello World！！！”
string s2(noNull, 2);   //从noNull拷贝两个字符；s2=="Hi"
string s3(noNull);      //未定义
string s4(cp+6, 5);     //从cp[6]开始拷贝5个字符
string s5(cp, 6, 5);    //从cp第6个字符开始，拷贝5个字符
string s6(cp, 6);       //从第6个拷贝到最后
string s7(s1, 6, 20);   //正确，只拷贝到s1末尾;s7=="World!!!"
string s8(s1, 16);      //抛出异常out_of_range

string s("hello world");
string s2=s.substr(0,5);    //s2=hello
string s3=s.substr(6);      //s3=world
string s4=s.substr(6, 11);  //s4=world
string s5=s.substr(12);     //抛出一个out_of_range异常

string s("C++ Primer"), s2=s;   //将s和s2初始化为C++ Primer
s.insert(s.size(), "4th Ed.");  //s==“C++ Primer 4th Ed。”
s2.append("4th Ed.");       //和上面的等价

s.erase(11, 3);     //s=="C++ Primer Ed."
s.insert(11, "5th");    //s=="C++ Primer 5th Ed."
//从位置11开始，删除3个字符并插入"5th"
s2.replace(11, 3, "Fifth");     //s=="C++ Primer Fifth Ed."
*/
/*
#include<iostream>
#include<string>

using namespace std;

int main()
{
    string s="hehe",oldVal="haha",newVal="myLove";

    s.insert(2, oldVal);
    s.insert(2, oldVal);
    s.insert(2, oldVal);

    s.erase(2, 12);
    s.insert(0, newVal);
    s.erase(6, 4);

    cout<<s;

    return 0;

}

string name("AnnaBelle");
auto pos1=name.find("Anna");    //pos1==0

string numbers("0123456789"), name("r2d2");
//返回1，即，name中第一个数字的下标
auto pos=name.find_first_of(numbers);

string dept("03714p3");
//返回5--字符'p'下标
auto pos=dept.find_first_not_of(numbers);

string::size_type pos=0;
//每步循环查找name中下一个数
while((pos=name.find_first_of(numbers, pos)) != string::npos)
{
    cout<<"found number at index: "<<pos
        <<" element is "<<name[pos]<<endl;

    ++pos;
}

*/