C++ Program

In many situation we have to make a difference between expressions defining a  value that can be addressed (and changed), which are called lvalue and value  that can be only read, called rvalue. For example, the assignment operator  expect a lvalue on the left and a rvalue on the right. So far the only lvalue we have seen are variables. #include <iostream> int main(int argc, char **argv) { int i; i+3 = 5; // does not compile 45 = i; // does not compile } leads to the following compilation errors : /tmp/something.cc: In function ‘int main()’: /tmp/something.cc:4: non-lvalue in assignment /tmp/something.cc:5: non-lvalue in assignment