CODEWITHSUNDEEP
user-defined-functionsbasic
Logan
Logan

Reputation: 946

Error in BASIC: expected '='

I received the error "ERROR: expected '='" while trying to compile my code. I'm guessing it has something to do with my function definition. Can anyone help?

1  REM declare function
2  DEF FNS(a) = a * a
3
4  REM declare variables
5  LET numOne = 0.0
6  LET answer = 0.0
7
8  REM get input from user
9  INPUT "Enter a number: "; numOne
10
11 REM get answer
12 answer = FNS(numOne)
13
14 REM display answer
15 PRINT "Answer: "; FNS(numOne)

Upvotes: 2

Views: 117

Answers (1)

dnep
dnep

Reputation: 562

Your code will work perfectly on many BASIC variants (e.g. AppleSoft - see this emulator), but not on every one.

If by JS Basic you mean this project, then realize that this variant has (as far as I know) no support for DEF FN, so you will have to do with GOSUB. Also, the arguments to PRINT and INPUT are sepparated by a simple whitespace (not semi-colon) and it is mandatory to append $ to each variable name.

I tweaked your code to work within those constraints (it runs alright in the JS Basic link above). I kept your line numbers multiplied by 10 to ease comparison.

00  GOTO 35
05
10  REM Subroutine SQUARE
15  REM Input: arg$ Output: result$
20  result$ = arg$ * arg$
25  RETURN
30
35  REM Program Start
40  REM declare variables
50  numOne$ = 0.0
60  answer$ = 0.0
70
80  REM get input from user
90  INPUT "Enter a number: " numOne$
100
110 REM get answer by calling SQUARE subroutine
112 arg$ = numOne$
115 GOSUB 10
120 answer$ = result$
130
140 REM display answer
150 PRINT "Answer: " answer$

Notice that in this variant you don't have to initialize your variables before using e.g. with INPUT, so you don't really need lines 50 and 60.

Upvotes: 2

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