/*
第17章 string基本字符序列容器
17.1 string技术原理
17.2 string应用基础
17.3 本章小结
*/
// 第17章 string基本字符序列容器
// 17.1 string技术原理 --------------------------------------------------------------------------------------
// 17.2 string应用基础 --------------------------------------------------------------------------------------
//259
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
string s1;
s1.push_back('a');
s1.push_back('b');
s1.push_back('c');
cout << "打印s1: " << s1 << endl;
//
char *cArray = "efgh";
string s2(cArray);
cout << "打印s2: " << s2 << endl;
//字符串的"+"操作
cout << "打印s1+s2: " << s1 + s2 << endl;
//字符串s1后添加字符串s2
cout << "append后,打印s1: " << s1.append(s2) << endl;
//在s1的第2个字符位置前插入字符'8'
string::iterator i;
i = s1.begin();
i++;
s1.insert(i, '8');
cout << "insert后,打印s1: " << s1 << endl;
//字符串的"+="操作
s1 += s2;
cout << "s1+=s2后,打印s1: " << s1 << endl;
return 0;
}
//260 遍历字符
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
char *cArray = "hello, world!";
string s(cArray);
//数组方式
for(unsigned int j = 0; j < s.size(); j++)
cout << "第" << j << "个字符: " << s[j] << endl;
//迭代器方式
string::reverse_iterator ri, rend;
rend = s.rend();
cout << "反向打印字符" << endl;
for(ri = s.rbegin(); ri != rend; ri++)
cout << *ri << ' ';
cout << endl;
return 0;
}
//261 erase
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
char *cArray = "a12345678b";
string s(cArray);
s.erase(s.begin());
cout << s << endl; //打印出12345678b
//
s.erase(s.begin() + 3, s.end() - 2);
cout << s << endl; //打印出1238b
//
s.erase(0, 2);
cout << s << endl; //打印38b
//
s.clear();
return 0;
}
//262 replace
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
char *cArray1 = "hello,boy!";
string s(cArray1);
//
s.replace(6, 3, "gril"); //boy替换为girl
cout << s << endl; //打印hello gril!
//
s.replace(10, 1, 1, '.'); //将"hello gril!"的'!'替换为'.'
cout << s << endl; //打印hello gril.
//
s.replace(s.begin(), s.begin() + 5, "good morning");
cout << s << endl; //打印good morning girl.
return 0;
}
//263, find
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
//0123456789012345678901234
string s("dog bird chicken bird cat");
//字符串查找
cout << s.find("bird") << endl; //打印4
cout << (int)s.find("pig") << endl; //打印-1
//字符查找
cout << s.find('i', 7) << endl; //打印11
//从字符串的末尾开始查找字符串
cout << s.rfind("bird") << endl; //打印17
//从字符串的末尾开始查找字符
cout << s.rfind('i') << endl; //打印18
//查找第1个属于某子串的字符
cout << s.find_first_of("13r98") << endl; //找到字符r,打印6
//查找第1个不属于某字符串的字符
cout << s.find_first_not_of("dog bird 2006") << endl; //找到字符c,打印9
//查找最后一个属于某子串的字符
cout << s.find_last_of("13r98") << endl; //字符r,打印19
//查找最后一个不属于某字符串的字符
cout << s.find_last_not_of("tea") << endl; //字符c,打印22
return 0;
}
//263-264, compare
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
string s1("abcdef");
string s2("abc");
cout << s1.compare("abcdef") << endl; //相等,打印0
cout << s1.compare(s2) << endl; //s1 > s2,打印1
cout << s1.compare("abyz") << endl; //s1 < "abyz",打印-1
//
cout << s1.compare(0, 3, s2) << endl; //s1的前3个字符==s2,打印0
return 0;
}
//264
#include <string>
#include <iostream>
int main(void)
{
using namespace std;
string s;
cout << s.empty() << endl; //空字符串,返回1
s += "1234567";
cout << s.empty() << endl; //不为空,返回0
cout << s.size() << endl; //7个字符,返回7
cout << s.length() << endl; //返回7
//
const char *cArray = s.c_str();
cout << cArray[2] << endl; //返回字符3
return 0;
}
// 17.3 本章小结 --------------------------------------------------------------------------------------
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