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About the Author-
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Epub ISBN: 9781616149345

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The randomly produced landscapes force students to think carefully about the effects' of muzzle velocity and angle of firing on the horizontal range achieved. 02) NEXT L% VDU 19,1,0,0,0,0 ENDPROC DEF PROCpause(t) LOCAL T T=TIME REPEAT UNTIL TIME >=T+t*100 ENDPROC PROC/FN List 180 FNX calculates the shell's X coordinate, from a knowledge of its Y value. 490 PROChit produces an explosion effect, sets the flag 'hit%' and increments and prints the number of hits. 600 PROCpause Program Description 20-80 Initialising section.

The main part is a REPEAT... UNTIL loop which ends when the space bar is pressed (A = 9). Within this loop, a FOR.. NEXT loop calculates the radius, draws the track and updates the meter reading for each isotope. PROCinit. The only unusual part of this procedure is the setting up of a 'look-up' table for the SIN and COS values. These are placed in the arrays S() and C() where they can be later accessed much more quickly than by recalling the SIN/COS Simulations, Demonstrations and Tutorials 45 functions each time.

Press any key to continue. 5) DEF PROCcentre(Y%,M$) PRINT TAB((40-LEN (M$)) DIV 2,Y%);M$; ENDPROC PROC/FN List 800 PROCrectangle draws a rectangle with its bottom left corner at the point (X,Y). 860 PROCscale draws and labels a scale, starting at the point (X,Y). 990 PROCvernier draws the vernier scale. 1140 FNI(R) returns an integer that gives the first significant figure after the decimal point of 'R'. 1150 PROCcentre prints the supplied string on the centre of the specified line. Program Description 10-790 Main program section.

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