The terms lvalue and rvalue are not something one runs into often in C/C++ programming, but when one does, it’s usually not immediately clear what they mean. The most common place to run into these terms are in compiler error & warning messages. For example, compiling the following with gcc:int foo() {return 2;}int main(){ foo() = 2; return 0;}You get:test.c: In function 'main':test.c:8:5: error: lvalue required as left operand of assignmentTrue, this code is somewhat perverse and not something you’d write, but the error message mentions lvalue, which is not a term one ...

A function is a group of related statements that accomplish a specific task. Understanding functions is a crucial step to programming in C++, as Brian Overland explains in this chapter from his book.The most fundamental building block in the programming toolkit is the function—often known as procedure or subroutinein other languages. A function is a group of related statements that accomplish a specific task. Once you define a function, you can execute it whenever you need to do so.Understanding functions is a crucial step to programming in C++: Without functions, it woul...