"The assignment operator is a single equal sign, = and is a right-to-left assignment. The variable that we wish to assign the value to appears on the left-hand-side while the value (literal, variable or expression) is on the right-hand-size. Using our variables from before, we can assign them values:\n\nnumUnits = 42;\n\ncostPerUnit = 32.79;\n\nfirstInitial = 'C';\n\nAn important thing to understand and to keep in mind is: if you declare a variable but do not assign it a value, its value is undefined. If we code something like int a;, the value of the variable a is not necessarily zero; depending on the system, it could contain a special value that indicates “uninitialized memory” or it could contain garbage, or it could have the value zero. The C standard does not specify default values for variables. The default value of variables is highly system dependent–on the compiler, the libraries, and even the operating system. You should not make any assumptions on the initial or default values of variables. If you need such assumptions, then values must be assigned. For brevity, C allows you to declare a variable and immediately assign it a value on the same line. Our example could be written more compactly written as follows:\n\nint numUnits = 42;\n\ndouble costPerUnit = 32.79;\n\nchar firstInitial = 'C';"