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Add some information on types.

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1 parent 9db6e2c commit c75a32a7183eab4b471430997bf44f18b2adba5e @chergert committed Oct 29, 2012
Showing with 17 additions and 4 deletions.
  1. +17 −4 chapters/chapter1.tex
@@ -56,7 +56,7 @@
Welcome to GNOME University! This chapter will get you started down the path of
-programming in C by introducting the process of writing source code in C,
+programming in C by introducing the process of writing source code in C,
compiling, and executing the resulting program. If you don't know what any of
that means, that's okay, we will learn!
@@ -67,9 +67,10 @@ \section{Source Code}
the program as we like. After which, we use a tool called a compiler to convert
that source code into machine code. Machine code is a representation of your
program in a format that your computers CPU can execute. As you might imagine,
-diferent types of CPUs have different representaions of your program. Compilers
+different types of CPU's have different representations of your program. Compilers
allow us to convert a single piece of code into machine code for multiple types
-of CPUs.
+of CPU's. Sometimes developers will refer to a ``toolchain'', which is a name
+for the collection of tools you need to build software for your machine.
\section{Hello, World}
@@ -118,7 +119,7 @@ \section{Hello, World}
\file{hello.c} matches the C code above and try again.
Once you have successfully compiled \file{hello.c}, we can execute the program
-from the terminal by prefixing \verb|./| to the filename to tell the terminal
+from the terminal by prefixing \verb|./| to the file-name to tell the terminal
to execute a file within the current directory.
@@ -240,4 +241,16 @@ \section{Variables}
+A type specifies what a variable can store. As you read earlier, \verb|int| can
+store whole numbers like -1, 0, or 1. There are other types that the C language
+knows about too. For example, the type \verb|double| knows how to store decimal
+numbers. Look at the example below assigning the decimal number \verb|123.45|
+to the variable named \verb|d|. Both \verb|int| and \verb|double| are examples
+of a \verb|type|. We will learn about other types as we progress through the
+double d = 123.45;

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