WHILE OPERATOR: "E97" EXAMPLES

On this page you can see the results of WHILE operator's realization in "E97" code. You may need to look additionally for some details about conditions coding.

1. WHILE x<5 DO {cycle's body}; (DE - address of variable x)

Address, code	Operations	Pascal comments
000A 01E1 000C 00DE	(DE) ==> R1	Extract x
000E 2451	compare R1 with const 5	Is x < 5 ?
0010 2C0D 0012 0022	jump if >=0	Exit if FALSE
0014 ... 001C	{cycle's body}
001E 1C0D 0020 000A	unconditional jump	To repeat cycle
0022

2. WHILE b DO {cycle's body}; (DF - address of BOOLEAN variable b)

Address, code	Operations	Pascal comments
000A 81E1 000C 00DF	(DF)b ==> R1	Extract b (byte value)
000E E401	compare R1b with 0b	Is b <> 0 (TRUE)?
0010 5C0D 0012 0022	jump if =0	Exit if FALSE
0014 ... 001C	{cycle's body}
001E 1C0D 0020 000A	unconditional jump	To repeat cycle
0022