Curricular Resources > 1981 Volume VI > Unit 4 (81.06.04) > Section 6

Computing

CONTENTS OF CURRICULUM UNIT 81.06.04

Unit Guide

Introducing Computer Programming in a Traditional Classroom

Lauretta J. Fox

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Computer Programs to Calculate the Area of a Square

Program 3

introduces interaction between the programmer and the computer. The results will be printed in a sentence.

10 REM FIND THE AREA OF A SQUARE

20 PRINT “HOW LONG IS THE SIDE OF THE SQUARE?”

30 INPUT S

40 IF S = 0 THEN 70

45 LET A = S 2

50 PRINT “THE SIDE OF THE SQUARE IS” S

60 PRINT “THE AREA OF THE SQUARE IS” A

65 GO TO 30

70 END

Result :	How long is the side of the square?
	? (The computer waits for the value to be typed) 49
	The side of the square is 49.
	The area of the square is 2401.
	? (Here the computer waits for the next value.) 32
	The side of the square is 32.
	The area of the square is 1024.
	? (This process repeats until the value O is given for a side, then the program stops.)

Explanation of Program 3 :

Line 20 asks the programmer to provide the data necessary to solve the problem.

Line 30 causes the computer to stop and wait for the programmer to type in the data.

Line 40 tells the computer that the programmer is finished when O is given as the length of a side.

Line 45 provides the formula to find the area of a square. The arrow pointing upward is used to signify that S is being raised to a power. The numeral 2 is the desired power.

Lines 50 result in a printout of the words inside the

60 quotation marks as well as the values of the variables S and A

Line 65 reroutes the computer back to line 30 for the next value of S. The program continues from line 30 to line 65 over and over until the value O is typed in to stop the program.

Program 4 provides a method for finding the areas of many squares. It introduces the concept of incrementing a number.

____ 10 REM FIND THE AREAS OF ALL SQUARES WHOSE SIDES

____ 11 REM ARE MULTIPLES OF THREE FROM 9 TO 81

____ 19 LET S = 9

____ 30 LET A = S 2

____ 32 PRINT “S= “ S, “A= “A

____ 40 LET S= S + 3

____ 41 IF S > 81 THEN 60

____ 45 GO T0 30

____ 60 END

Result:	S = 9	A = 81
	S = 12	A = 144
	S 15	A 225
	S 18	A 324
	. . . . . .	. . . . . .
	S 75	A 5625
	S 78	A 6084
	S 81	A 6561

Explanation of Program 4

Line 40 S=S+3 is not an equation. It means to replace S 3 with the number whose value is 3 more than the previous value of S.

Line 41 tells the computer to stop the program when the value of S becomes greater than 81.

Line 45 reroutes the computer back to repeat lines 30, 32 and 40 until the value of S is greater than 81.

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Line 20	asks the programmer to provide the data necessary to solve the problem.
Line 30	causes the computer to stop and wait for the programmer to type in the data.
Line 40	tells the computer that the programmer is finished when O is given as the length of a side.
Line 45	provides the formula to find the area of a square. The arrow pointing upward is used to signify that S is being raised to a power. The numeral 2 is the desired power.
Lines 50	result in a printout of the words inside the
60	quotation marks as well as the values of the variables S and A
Line 65	reroutes the computer back to line 30 for the next value of S. The program continues from line 30 to line 65 over and over until the value O is typed in to stop the program.
Program 4	provides a method for finding the areas of many squares. It introduces the concept of incrementing a number.

Line 40	S=S+3 is not an equation. It means to replace S 3 with the number whose value is 3 more than the previous value of S.
Line 41	tells the computer to stop the program when the value of S becomes greater than 81.
Line 45	reroutes the computer back to repeat lines 30, 32 and 40 until the value of S is greater than 81.