C++ is a computer language itself. used to make applications, games, etc.. It is not possible to download the language because you have to learn it. Source code is what you look at when you want to see how an application (made by the C++ language) is made. For example here is a source code that many C++ learners begin with called "hello world" source code:
Code:
#include<iostream.h>
using namespace std;
int main() {
cout<<"Hello world";
}
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