Declarations and Reach

Abstract

This chapter is about declarations. As you have already seen, declarations are used in every Algol-68 program to set up space for working variables and to attach names to the various storage cells that may be needed.

“‘The name of the song is called ‘Haddocks’ Eyes’.”“Oh, that’s the name of the song, is it?” Alice said, trying to feel interested. “No, you don’t understand,” the Knight said, looking a little vexed. “That’s what the name is called. The name really is ‘The Aged Aged Man’.”“Then I ought to have said ‘That’s what the song is called’?” Alice corrected herself. “No, you oughtn’t: that’s quite another thing! The song is called ’Ways And Means’: but that’s only what it’s called you know!”“Well, what is the song, then?” said Alice, who was by this time completely bewildered.“I was coming to that,” the Knight said. “The song really is ‘A-sitting on a Gate’: and the tune’s my own invention.”’

Lewis Carroll, Alice through the Looking Glass