String类使用范例

#include <string>    //   使用 string 类时须包含这个文件
#include <iostream>

using namespace std;

int main()
{
    string str1;
   
    //   输入与输出
     cout << "输入字符串 str1" << endl;
     cin >> str1; getchar();
     cout << str1 << endl << endl << endl;
    
    //   一行行读取
     cout << "输入字符串 str1" << endl;
     getline( cin, str1 );
     cout << str1 << endl;

    //   与 c字符转换
    string str2("Hello World!"), str3;
    char    str4[50];

     cout << "输入 C 字符串" << endl;
     scanf("%s",str4);
     str3= str4;

     cout << "str2 is " << str2 << endl;
     cout << "str3 is " << str3 << endl << endl << endl;

    //   求字符串的长度
    string str5;
     cout << "输入字符串 str5" << endl;
     cin >> str5;
    int    len= str5.size();
     cout << "字符串 str5的长度为" << len << endl << endl << endl;

    //   遍历字符串例子
    string str6;
     cout << "输入字符串 str6" << endl;
     cin >> str6;
    int i;
    for( i= 0; i< str6.size(); ++i )
     cout << str6[i];
     cout << endl << endl;

    //   比较两个字符串    比较规则同 c字符串比较规则
    string str7, str8;
     cout << "输入字符串 str7, str8 , 中间用空格格开" << endl;
     cin >> str7 >> str8;

    if( str7< str8 ) cout << str7 << "   小于 " << str8 << endl;
    else if( str7> str8 ) cout << str7 << "   大于 " << str8 << endl;
    else cout << str7 << "   等于 " << str8 << endl;
    
    
    //   字符串与字符相加
    string str9= "Darren";
    char ch1= ‘a’, ch2= ‘b’;
     str9= str9+ ch1; cout << str9 << endl << endl;
     str9= ch2+ str9; cout << str9 << endl << endl << endl;
    
    //   字符串与字符串相加
    string str10= "Acm", str11= "ICPC";
     str10.append( str11 );
     cout << str10 << endl << endl;
    
    //   字符串是否包含子串   如果包含 则返回子串在目标串中第一次出现的位置
    string str12= "I am a student", str13= "student", str14= "aaaaaaa";
    if( str12.find( str13 )!= -1 )   cout << "Find " << str13 << endl;
    if( str12.find( str14 )== -1 )   cout << "Not Find  " << str14 << endl;
    
    //   转换成 c_字符串
    string str15= "Hello World";
     printf("%sn", str15.c_str() );
     
     system("pause");

    return 0;
}

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