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Now downloading free:IBM C20-1620-0 360pgmPtrs

IBM C20-1620-0 360pgmPtrs free download

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Form C20-1620-0 Analysis System/360 Pointers Programming Techniques This manual of System/360 pointers is devoted to examples illustrating various coding techniques. It not only shows the use of some of the features of the assembly language but more importantly points out the power of the System/360 organization in the solution of common problems or parts thereof. Although many of the examples are slanted toward the mathematician, there are those of sufficiently general interest to provide Programming knowledge for the commercially oriented. Scientific FOREWORD The examples presented in this manual are small in size and are intended for a reader who is interested in an introduction to System/360 programming. While studying the various pieces of code, it is advisable to have access to the following manuals: System/360 Principles of Operation (A22-6821-1) -- referred to as "OM" System/360 Operating System -- Assembly Language (C28-6514-1) -- referred to as "AM" References are made to these manuals in the subsequent pages. There are three basic sections in this document. In the first two sections, the basic instruction set is illustrated through simple examples. It is intended that the examples increase in complexity, each tending to illustrate some particular point relative to a coding technique. Pertinent comments are included. The final section shows complete problems, including the necessary assembly language parameters to produce a running program. The problems of this section have actually been run on a machine. The programs shown represent "good" coding practices. They have not been optimized to their fullest. This optimization is left as an exercise to the reader. Where optional methods of approach can be taken, they are shown and discussed. Copies of this and other IBM publications can be obtained through IBM branch offices. Address comments concerning the contents of this publication to IBM, Technical Publications Department, 112 East Post Road, White Plains, N. Y. 10601 CONTENTS 1. Fixed-Point, Logical and Branch Instructions. . . . . . . . . . . . . . . 1 1. 1 Use of Multiple Registers for Storing Intermediate Results. 1 1. 2 Evaluation of a Simple Arithmetic Expression. . . . . . . . 1 1. 3 Cyclic Purmutation of a Word Group Using Multiple Register Commands. 2 1.4 Clearing of a Space in Storage Using Loop Control Techniques . . . . . 3 1. 5 Extraction of one Element of a Matrix - Two Dimensional Table Lookup. 5 1. 6 Cyclic Bit Shifting. . . . . . . . . . . . . . . . . . . . . 5 1. 7 Sum of Squares Using Double-Precision Fixed-Point Arithmetic 6 1. 8 Transposition of a Square Matrix Using Address Constants. . . . 7 1. 9 Length of an Unknown Fi

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