wwwbasic/examples/primes.html at master · thomasmcneill/wwwbasic · GitHub

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<!--
Copyright 2018 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!DOCTYPE html>
<script src="../wwwbasic.js"></script>
<script type="text/basic">

PRINT 2; " ";
FOR i = 3 TO 3000 STEP 2
    IN = i
    GOSUB GetLengthOfNumber
    prime = 1
    FOR j = 3 TO i / OUT
        IF i MOD j = 0 THEN prime = 0: EXIT SUB
    NEXT j
    IF prime THEN PRINT i; " ";
NEXT i
END

GetLengthOfNumber:
    A = 1
    WHILE IN > 9
        A = A + 1
        IN = IN / 10
    WEND
    OUT = A + 1
    A = 1
RETURN

</script>