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is string a number or not

Ejlersen

Hi

I've been searching for a funtion to check if a string is a number or not.

stringsamples could be

data="8FLASH"

data="8"

data="8.1"

atoi will return 8 for all of the above, atof will return 8.0 for them all

Anyone know a function to test this?

Best regards

Ole

 

Parents
  • djhutchi
    > procedure( test(arg) if(rexMatchp("^[0-9]*[.]*[0-9]+$" arg) then printf("%s is a number\n" arg) else printf("%s is not a number\n" arg)))

    function test redefined

    test

    > test( "0.2")

    0.2 is a number

    t

    > test("2.0")

    2.0 is a number

    t

    > test( "8")

    8 is a number

    t

    > test("8FLASH")

    8FLASH is not a number

    t

    >
Reply
  • djhutchi
    > procedure( test(arg) if(rexMatchp("^[0-9]*[.]*[0-9]+$" arg) then printf("%s is a number\n" arg) else printf("%s is not a number\n" arg)))

    function test redefined

    test

    > test( "0.2")

    0.2 is a number

    t

    > test("2.0")

    2.0 is a number

    t

    > test( "8")

    8 is a number

    t

    > test("8FLASH")

    8FLASH is not a number

    t

    >
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