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void TTT(){
 
    tinyxml2::XMLDocument docXml;
    XMLError errXml = docXml.LoadFile("../oldData.xml");
    if (XML_SUCCESS == errXml){
        XMLElement* elmtRoot = docXml.RootElement();
        XMLElement *elmtStaff = elmtRoot->FirstChildElement("Staff");
        XMLElement *elmtName = elmtStaff->FirstChildElement("Name");
        if (elmtName)
        {
            const char* pContent = elmtName->GetText();
            printf( "%s", pContent);
        }
 
        XMLElement *elmtID = elmtName->NextSiblingElement("ID");
        if (elmtID)
        {
            const char* pContent= elmtID->GetText();
            printf( "%s", pContent);
        }
        XMLElement *elmtDepartment = elmtID->NextSiblingElement("Department");
        if (elmtDepartment)
        {
            const char* pContent= elmtDepartment->GetText();
            printf( "%s", pContent);
        }
        XMLElement *elmtSalary = elmtDepartment->NextSiblingElement("Salary");
        if (elmtSalary)
        {
            const char* pContent= elmtSalary->GetText();
            printf( "%s", pContent);
        }
        XMLElement *elmtAge = elmtName->NextSiblingElement();
        if (elmtAge)
        {
            const char* pContent= elmtAge->GetText();
            printf( "%s", pContent);
        }
    }
}
 
int main(int argc, char **argv)
{
 
     TTT();
 
	return 0;
}
//The following txt is what the program reads.
/*
 
 
<Staff>
 <Name> David Lee </Name>
 <ID> 1234567 </ID>
 <age> 38 </age>
 <Department> CS </Department>
 <Salary> 100000</Salary>
</Staff>
<Staff>
 <Name> Jeff Wu </Name >
 <ID> 1234568 </ID>
 <age> 50 </age>
 <Department> EE </Department>
 <Salary> 200000</Salary>
</Staff>
<Staff>
 <Name> Nancy Wang </Name >
 <ID> 1234569 </ID>
 <age> 43 </age>
 <Department> CS </Department>
 <Salary> 160000</Salary>
</Staff>*/

prog.cpp: In function ‘void TTT()’:
prog.cpp:3:5: error: ‘tinyxml2’ has not been declared
     tinyxml2::XMLDocument docXml;
     ^~~~~~~~
prog.cpp:4:5: error: ‘XMLError’ was not declared in this scope
     XMLError errXml = docXml.LoadFile("../oldData.xml");
     ^~~~~~~~
prog.cpp:5:9: error: ‘XML_SUCCESS’ was not declared in this scope
     if (XML_SUCCESS == errXml){
         ^~~~~~~~~~~
prog.cpp:5:24: error: ‘errXml’ was not declared in this scope
     if (XML_SUCCESS == errXml){
                        ^~~~~~
prog.cpp:6:9: error: ‘XMLElement’ was not declared in this scope
         XMLElement* elmtRoot = docXml.RootElement();
         ^~~~~~~~~~
prog.cpp:6:21: error: ‘elmtRoot’ was not declared in this scope
         XMLElement* elmtRoot = docXml.RootElement();
                     ^~~~~~~~
prog.cpp:6:32: error: ‘docXml’ was not declared in this scope
         XMLElement* elmtRoot = docXml.RootElement();
                                ^~~~~~
prog.cpp:7:21: error: ‘elmtStaff’ was not declared in this scope
         XMLElement *elmtStaff = elmtRoot->FirstChildElement("Staff");
                     ^~~~~~~~~
prog.cpp:8:21: error: ‘elmtName’ was not declared in this scope
         XMLElement *elmtName = elmtStaff->FirstChildElement("Name");
                     ^~~~~~~~
prog.cpp:12:35: error: ‘printf’ was not declared in this scope
             printf( "%s", pContent);
                                   ^
prog.cpp:15:21: error: ‘elmtID’ was not declared in this scope
         XMLElement *elmtID = elmtName->NextSiblingElement("ID");
                     ^~~~~~
prog.cpp:19:35: error: ‘printf’ was not declared in this scope
             printf( "%s", pContent);
                                   ^
prog.cpp:21:21: error: ‘elmtDepartment’ was not declared in this scope
         XMLElement *elmtDepartment = elmtID->NextSiblingElement("Department");
                     ^~~~~~~~~~~~~~
prog.cpp:25:35: error: ‘printf’ was not declared in this scope
             printf( "%s", pContent);
                                   ^
prog.cpp:27:21: error: ‘elmtSalary’ was not declared in this scope
         XMLElement *elmtSalary = elmtDepartment->NextSiblingElement("Salary");
                     ^~~~~~~~~~
prog.cpp:31:35: error: ‘printf’ was not declared in this scope
             printf( "%s", pContent);
                                   ^
prog.cpp:33:21: error: ‘elmtAge’ was not declared in this scope
         XMLElement *elmtAge = elmtName->NextSiblingElement();
                     ^~~~~~~
prog.cpp:37:35: error: ‘printf’ was not declared in this scope
             printf( "%s", pContent);
                                   ^

Standard output is empty