Handyboard and Kit Manual (A.K.A. - Botball Programming Guide)

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© 2002 D.Miller, KIPR27Making a Decision with if• Syntax if () {statements}• The statements are skipped if the test isfalsevoid main(){int j=-2;if (j < 0) /* skip if >= 0 */{j = -j; /* change sign of x */}printf(“magnitude is %d\n”,j);}© 2002 D.Miller, KIPR28Either/Or Selection: if-else• Syntax if () {statements for true case} else {statements for false case}• If the test is true {statements for true case} are selected• If the test is false {statements for false case} are selectedvoid main(){int j=-2;if (j < 0) /* select less than 0 case */{printf(“%d is negative\n”,j);}else /* select greater than or equal to 0 case */{printf(“%d is non-negative\n”,j);}}14
© 2002 D.Miller, KIPR29IC: if () … else• Syntax recap: if () { …} else { …}void main(){if(digital(15)==1) /* select “forward” case */{motor(3,50);printf(“Forward\n”);}else /* select “reverse” case */}{motor(3,-75);printf(“Reverse\n”);}sleep(2.0); /* let motor run 2 secs */off(3); /* stop motor */© 2002 D.Miller, KIPR30IC: Selection Nested in Loopvoid main(){while (stop_button()==0) /* loop until stop */{if(digital(15)==1) /* select “forward” case */{motor(3,50);printf(“Forward\n”);}else /* select “reverse” case */{motor(3,-75);printf(“Reverse\n”);}sleep(2.0); /* let motor run for 2 secs */}off(3); /* turn off motor */}Teaser: what happens if you press <strong>and</strong> release stop while it is sleeping?15
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Page 8 and 9: © 2002 D.Miller, KIPR15IC Interact
Page 10 and 11: © 2002 D.Miller, KIPR19• Tools m
Page 12 and 13: © 2002 D.Miller, KIPR23Repeating E
Page 16 and 17: © 2002 D.Miller, KIPR31IC: Functio
Page 18 and 19: © 2002 D.Miller, KIPR35IC Programm
Page 20 and 21: © 2002 D.Miller, KIPR39Sensor Type
Page 22 and 23: © 2002 D.Miller, KIPR43• Stop Bu
Page 24 and 25: © 2002 D.Miller, KIPR47Optical Ran
Page 26 and 27: © 2002 D.Miller, KIPR51• Digital
Page 28 and 29: © 2002 D.Miller, KIPR55Simple Enco
Page 30 and 31: © 2002 D.Miller, KIPRExperimenting
Page 32 and 33: © 2002 D.Miller, KIPR63RCX SetupTo
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Handyboard and Kit Manual (A.K.A. - Botball Programming Guide)

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