Qbasic

In Program QWIEN (written in QBASIC, Appendix A), x is initialized at 1 and incremented by 0.1 in line 3, which is given the statement number 10 for future reference. Be careful to differentiate between a statement number like 10 x = x -E. 1 and the product 10 times r which is 10%. A number a is calculated for x= 1.1 that is obviously too small so (a — 1) is less than 0 and the IF statement in line 5 sends conhol back to the statement numbered 10, which increments a by 0.1 again. This continues until (a — 1) > 0, whereupon control exits from the loop and prints the result for a and a . 

Our Simpson s rule program is written in QBASIC (Appendix A). Today s computer world is full of complicated and expensive software, some of which we shall use in later chapters. Unfortunately, it is not hard to find software that is overpriced and overwritten (which we shall not use). Although it is not appropriate to recommend software in a book of this kind, the simple software used here has been used for several years in both a teaching and a research setting. It works. 

Solve, by hand, by Mathcad, and with youi QBASIC programs... 

This is not E, i , of course you must find the minimum energy by systematic variation of ot. Alternatively, a QBASIC or TBASIC program can be written to integrate Eq. (6-28) by Simpson s rule. 

Using as many methods as are available to you for comparison (Mathcad, QBASIC, and TRUE BASIC), determine the self-consistent field (SCF) energies of the He atom and of the ions Li+, Be " ", and B +. Fill in the SCF column of Table 8-1. 

The source code is now in VisualBasic (it used to be in GW-BASIC, later in QBASIC) the files are provided in compiled form, together with a structured menu. Some Excel files are included in the XLS directory. 

In addition to this feature, several software utilities made their debut. The most commonly used utility introduced at this time was EDIT.COM. This ASCII text editor has since become one of the most popular text editors for simple text files (and a welcomed relief from the single-line view ofEDLIN.COM—previously the only choice for a text editor). Also added in DOS 5 were QBASIC.EXE, DOSKEY, UNFORMAT, and UNDELETE. 

As noted earlier in this chapter, some versions of BASIC do not have an ACOS function. Included here is a program by William Rudge that computes this function. It should work in QBASIC or QuickBASIC. 

QBasic I Algorithm Advanc (D) Advanced convergence parameters —... 

With the computer turned on and "booted up," a file searching program is used to find QBASIC or ABASIC or BASIC, which is probably in the C WINDOWS directory or in the original CD-ROM. Opening that file, or else typing those letters and then hitting the RETURN key, BASIC will run. If a "help" screen shows first, press the ESC key to bypass it. With the cursor in the upper, "Untitled" window, the experimenter should then type... 

I For example, with the DOS prompt visible, type dir/s/p basic. to find QBASIC or ABASIC. 

Since the flow calculations need to be repeated at various points on the pump curve, a computer program would be useful. The program AXIAL-RADIAL was developed by the author in Qbasic, a language easy to understand by most engineers, but experts may modify it to PASCAL, C+, Fortran, or other languages as it suits their needs. It calculates both hydraulic and axial loads on the pump impeller. 

---