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Adds an example in COBOL #247

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Adds an example in COBOL #247

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f07306d
Adds a COBOL example
baptistecolin Apr 1, 2024
1925b91
adds explanation about the HFP format + removes an outstanding quote
baptistecolin Apr 1, 2024
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25 changes: 25 additions & 0 deletions _posts/2024-04-01-cobol.md
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---
title: COBOL
code: |-
IDENTIFICATION DIVISION.
PROGRAM-ID. HFPMATH.
DATA DIVISION.
WORKING-STORAGE SECTION.
77 X-32 USAGE COMP-1.
77 X-64 USAGE COMP-2.
PROCEDURE DIVISION.
COMPUTE X-32 = 0.1 + 0.2.
DISPLAY X-32.
COMPUTE X-64 = 0.1 + 0.2.
DISPLAY X-64.
MOVE 0.1 TO X-64.
DISPLAY X-64.
result: |-
0.30000001
0.3
0.09999999999999999
---

COBOL encodes floating-point numbers using the [HFP][1] format instead of IEEE754, leading to different but analogous computation inaccuracies.

[1]: https://en.wikipedia.org/wiki/IBM_hexadecimal_floating-point