DFSORT——前三位不等于0（COMP-3, COMP）
Requirement: The first 3 not equal to 0
(1) 01 WS-A PIC S9(09) COMP-3.
Analysis:
S9(09) COMP-3, X'000000', range is 999999999- and 999999999+
Check the 3 leftmost digits, then the range will be 000000999- and 000000999+
There are 2 solutions here:
1. COND=(1,5,PD,LT,-000000999,OR,1,5,PD,GT,+000000999)
2. COND=(1,2,PD,NE,0,AND,3,2,PD,NE,0,AND,5,2,PD,NE,0)
(2) 01 WS-B PIC S9(09) COMP.
Analysis:
S9(09) COMP, X'F0F0F0'
1. COND=(1,2,EQ,X'F0',AND,3,2,EQ,X'F0',AND,5,2,EQ,X'F0')
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