Computer Science, Information Technology : Engineering Notes

The assignment, if, while, read and write statements are translated as follows:

Assignment	x := expr		code for expr STORE X
Conditional	if C then S1 else S2 end	L1: L2:	code for C BR_FALSE L1 code for S1 BR L2 code for S2
While-do	while C do S	L1: L2:	code for C BR_FALSE L2 code for S BR L1
Input	read X		IN_INT X
Output	write expr		code for expr OUT_INT

If the code is placed in an array, then the label addresses must be back-patched into the code when they become available.

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