The C++ Data Types

int v[20];

// function g() returns the reference of v[I]

int& g(int I) { return v[I];}

main(){

// function main can not directly access the elements of v[ ]

g(3) = 7; // same as v[3] = 7

// Notice that a function call can be placed on the left side of an

// assignment operator

// the expression g(3) is called an lvalue since g() returns a

// reference