Level 3

Add a simple branch - if-then-else, a for and while loop to the language at Level 2. The basic control constructs for branching and loop - finite and infinite - should now enable us to write more effective programs.

Some examples of source programs are:

1.   int i;
     int n;
     int factorial;
   
     if (n == 0)
       factorial = 1;
     else
       for (i = 1; i < n; i = i + 1)
         factorial = factorial * i;