DATA TYPES CONVERSION Programmer's Guide: HP 3000 MPE/iX Computer Systems

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HP Part Number: 32650-90015

Edition: Second Edition

Published: Printed in the U.S.A 1989

Table of Contents

1 Introduction

How Do the Programmer and the Computer Communicate Data?

Defining Data Types

Primitive Data Types
Intrinsic Data Types
Language Data Types

Formatting Data Types

Programming Environment
Programming Languages

Converting Data Types

Using Different Types Together
Passing Between Programming Environments
Passing Across Programming Languages

2 Formatting Data Types

Recognizing Primitive Data Types

Character
Numeric

Formatting Data in Programs

NM and CM Programming Environments
Programming Languages

3 Converting Data Types

Passing Data

Converting from Character:

To Other Character
To Integer
To Real
To Packed Decimal

Converting from Integer

To Character
To Other Integer
To Real
To Packed Decimal

Converting From Real

To Character
To Integer
To Other Real
To Packed Decimal

Converting from Packed Decimal

To Character
To Integer
To Real
To Other Decimals

A ASCII and EBCDIC Code Values

List of Figures

2-1 Bit Format: ASCII Character
2-2 Bit Format: EBCDIC Character
2-3 Bit Format: 32-Bit Integer
2-4 Bit Format: Single-Precision Real in IEEE Floating-Point Notation
2-5 Bit Format: Double-Precision Real in IEEE Floating-Point Notation
2-6 Bit Format: Single-Precision Real in HP3000 Floating-point Notation HP3000 Real Number Format.
2-7 Bit Format: Double-Precision Real in HP3000 Floating-point Notation
2-8 Bit Format: BCD Nibble
2-9 Bit Format: Packed Decimal
2-10 Bit Format: Floating-Point Decimal
2-11 Bit Format: Short Floating-Point Decimal

List of Tables

1-1 Languages Supported on MPE XL
2-1 MPE XL Integer Types
2-2 Ranges and Accuracies for Floating-Point Real Numbers
2-3 Determining the Base-Ten Equivalent of an IEEE Real Number
2-4 Range and Precision for Floating-Point Decimals
2-5 Correspondence of Data Types Across Languages: Intrinsics, BASIC, and C
2-6 Correspondence of Data Types Across Languages: COBOL, FORTRAN, and Pascal
A-1 ASCII/EBCDIC Character Sets


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