Add new file

QMap2

+#include <QCoreApplication>
+#include <QDebug>
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+    QMap<QString,QString> map;
+    map.insert("beijing","111");
+    map.insert("shanghai","021");
+    map.insert("jinan","0531");
+        QMap<QString,QString>::const_iterator i;
+    for(i=map.constBegin();i!=map.constEnd();++i)
+        qDebug()<<" "<<i.key()<<" "<<i.value();
+    QMap<QString,QString>::iterator mi;
+    mi=map.find("beijing");
+    if(mi!=map.end())
+        mi.value()="010";
+    QMap<QString,QString>::const_iterator modi;
+    qDebug()<<" ";
+    for(modi=map.constBegin();modi!=map.constEnd();++modi)
+        qDebug()<<" "<<modi.key()<<" "<<modi.value();
+    return a.exec();
+}
\ No newline at end of file