Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

Punctuating constants

To improve readability, arithmetic, bit, and hexadecimal constants can use the break character ( _ ).

'1100_1010'B is the same as '11001010'B
1100_1010B is the same as 11001010B
'C_A'B4 is the same as 'ca'b4
'C_A'XN is the same as 'ca'XN
16_777_216 is the same as 16777216

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