Our Choice Levels of the Source Language

The source language level sequence we use is roughly as:

• Level 0: An extremely trimmed down version of C is used. It is expression oriented, uses only integer addition, uses variables. Assignment operation is required.
• Level 1: To the language in Level 0, add other arithmetic operators (-, $\star$, / and %) and boolean operators (!, $\vert\vert$, &&). Bitwise operators are not to be added. Unary `-' is also required as is the conditional (aka ternary) : ``?:''.
• Level 2: Add basic data types: character, integer arrays and single precision floating point to Level 1.
• Level 3: Add a simple branch - if-then-else, a for and while loop to the language at Level 2.
• Level 4: Add function definition, call and return mechanism to the language in Level 3.

Sample programs and corresponding IR dumps