// string.cpp : ¶¨Òå¿ØÖÆ̨ӦÓóÌÐòµÄÈë¿Úµã¡£
// ±ê×¼C++ÖÐstringÀ࣬±ØÐëÒª#includeºÍusing namespace std;
// È»ºó¾Í¿ÉÒÔÓÃstring/wstringÁË£¬ËüÃÇÁ½·Ö±ð¶ÔÓ¦×ÅcharºÍwchar_t
// Ö÷Òª²Î¿¼ÎÄÏ×
// 1¡¢±ê×¼C++ÖеÄstringÀàµÄÓ÷¨×ܽᣨת£©
// http://www.cnblogs.com/xFreedom/archive/2011/05/16/2048037.html
#include "stdafx.h"
#include
#include
#include
#include
using namespace std;
/*
³õʼ»¯±äÁ¿demo
*/
void InitialDemo()
{
string str1(5, 'c');//³õʼ»¯Îª5¸ö'c'
string str2("Now is the time...");
string str3(str2, 11, 4);//´Óstr2µÄµÚ11¸ö×Ö·û¿ªÊ¼£¬¶ÁÈ¡4¸ö×Ö·û
string str4;
str4.append(3, 'h');//Ôö¼Ó3¸ö'h'
char chr[6];
memset(chr, '\0', sizeof(chr));
chr[0] = '2';
string str5(chr);
cout << endl << "InitialDemo:" << endl;
cout << str1 << endl;
if(str1[5]== '\0')
{
cout << "Ô½½çÊä³ö£ºstr1[5]=\0" << endl;//¿Õ
}
else
{
cout << "Ô½½çÊä³ö£ºstr1[5]=" << str1[5] << endl;//¿Õ
}
//cout << "Ô½½çÊä³ö£ºstr1[6]=" << str1[6] << endl;//Òì³£
cout << str2 << endl;
cout << str3 << endl;
cout << str4 << endl;
cout << str5 << endl;
}
/*
¸³ÖµºÍÌæ»»demo
*/
void AssignReplaceDemo()
{
cout << endl << "AssignReplaceDemo:" << endl;
string str1, str2 = "War and Peace";
str1.assign(str2, 4, 3);
cout << str1 << endl;
string s = "They say he carved it himself...from a BIGGER spoon";
string s2 = "find your soul-mate, Homer.";
//s[1] = "1";²»ÄÜÓÃÕâÖÖÐÎʽ
//replace(off,number,new string)
s.replace(5, s2.length(), s2);
//char* p;char c = s[0];p = &c;
//s.replace(5, 1, p);
//½á¹ûΪ"They say he carved it himself...find your soul-mate, Homer."
cout << s << endl;
}
string ReverseStringDemo(string s)
{
int left = 0, right = s.size() - 1;
while (left < right)
{
char t = s[left];
s[left++] = s[right];
s[right--] = t;
}
return s;
}
string ReverseStringDemo2(string s) {
int left = 0, right = s.size() - 1;
while (left < right) {
swap(s[left++], s[right--]);
}
return s;
}
void Change2CharDemo()
{
cout << endl << "Change2CharDemo:" << endl;
string str1 = "War and Peace";
const char* chr = str1.c_str();
cout << chr << endl;
}
void Change2IntDemo()
{
string str1 = "-20";
string str2 = "5";
int ret = stoi(str1) + stoi(str2);
cout << "string to int: -20+5=" << ret << " " << endl;
int a = -3, b = 37;
string a_plus_b = to_string(a + b);
cout << "int to string: -3+37=" << a_plus_b << " " << endl;
string str3 = "-0x12";
string str4 = "0x76E";//1902
char *offset;
cout << "string to int: -0x12=" << strtol(str3.c_str(),&offset,0) << " " << endl;
cout << "string to int: 0x76E=" << strtol(str4.c_str(), &offset, 0) << " " << endl;
cout << "string to int: 0x76E=" << stol(str4, nullptr,0) << " " << endl;
string str5 = "A4";
char *offset5;
int istr5 = strtol(str5.c_str(), &offset5, 10);
cout << "string to int: A4=" << istr5 << " " << endl;//0
}
void SubStringDemo()
{
string str = "20+-22i";
int size = str.size();
int plus = str.find("+");
string real = str.substr(0, plus);//off,count
string imaginary = str.substr(plus + 1, size - plus - 2);
cout << "substring: " << real << " " << imaginary << endl;
}
void FindDemo()
{
string str;
cout << "FindDemo: please cin words and find spaces "<