C + +, a variable in a const object cannot be modified

A variable in a const object cannot be modified, even if a function in a const object cannot modify the value of a variable in that object

#include <iostream>using namespacestd;//-----------------------------------------------classTest { Public:    intx;    Test (); voidChangeinta);}; Test::test () { This->x = at;}voidTest::change (inta) {     This->x=A;}//-----------------------------------------------voidF1 () {Test T1; t1.x=111; cout<<"t1.x="<<t1.x<<Endl; T1.change (1111); cout<<"t1.x="<<t1.x<<Endl; ConstTest T2; cout<<"t2.x="<<t2.x<<Endl; //a variable in a const object cannot be modified, even if a function in a const object cannot modify the value of a variable in that object. //g++: Error:assignment of Data-member ' test::y ' in read-only structure//t2.x = ten;//vs2010 can be compiled through, but execution does not change the value of t2.x//cout<< "t2.x=" <<t2.x<<endl; //T2.change (2222);//error C2662: "Test::change": Cannot convert "This" pointer from "Const test" to "Test & "    }intMain () {F1 ();  while(1); return 0;}

C + +, a variable in a const object cannot be modified