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  • C++ Map运用实例

    C++ Map运用实例

    #include <map>
    #include <string>
    #include <iostream>
    #include <iomanip>
    
    using namespace std;
    
    int main()
    {
        typedef map<string, float> stringFloatMap;
    
        //create empty container
        stringFloatMap stocks1;
    
        //插入元素
        stocks1["BASF"] = 369.50;
        stocks1["VW"] = 413.50;
        stocks1["Daimler"] = 819.00;
        stocks1["BMW"] = 834.00;
        stocks1["Simements"] = 842.20;
    
        //输出
        stringFloatMap::iterator iter1;
        cout << left;
        for (iter1 = stocks1.begin();iter1 != stocks1.end();++iter1)
        {
            cout << "stock1:"<<setw(12)<<iter1->first<<"  price:"<<iter1->second << endl;
        }
        cout << endl;
    
        //所有 float统一变换
        for (iter1 = stocks1.begin();iter1 != stocks1.end();++iter1)
        {
            iter1->second *= 2;
        }
    
        //输出
        for (iter1 = stocks1.begin(); iter1 != stocks1.end(); ++iter1)
        {
            cout << "stock1:" << setw(12) << iter1->first << "  price:" << iter1->second << endl;
        }
        cout << endl;
    
        stocks1["Volkswagen"] = stocks1["VW"];
        stocks1.erase("VW");
    
        //输出
        for (iter1 = stocks1.begin(); iter1 != stocks1.end(); ++iter1)
        {
            cout << "stock1:" << setw(12) << iter1->first << "  price:" << iter1->second << endl;
        }
        cout << endl;
    
        system("pause");
        return 0;
    }

    stock1:BASF price:369.5
    stock1:BMW price:834
    stock1:Daimler price:819
    stock1:Simements price:842.2
    stock1:VW price:413.5

    stock1:BASF price:739
    stock1:BMW price:1668
    stock1:Daimler price:1638
    stock1:Simements price:1684.4
    stock1:VW price:827

    stock1:BASF price:739
    stock1:BMW price:1668
    stock1:Daimler price:1638
    stock1:Simements price:1684.4
    stock1:Volkswagen price:827

    请按任意键继续. . .

    代码参考:C++标准库(第2版)

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  • 原文地址:https://www.cnblogs.com/herd/p/12063647.html
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