{"id":2317,"date":"2025-04-15T10:00:28","date_gmt":"2025-04-15T10:00:28","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=2317"},"modified":"2025-06-10T06:58:37","modified_gmt":"2025-06-10T06:58:37","slug":"iifgetnum-bbnnfw-d28","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/communications-instructions\/iifgetnum-bbnnfw-d28\/","title":{"rendered":"iifGetNum bb#,nn,fw [D>=28]"},"content":{"rendered":"\n

W = (float){Ascii2Decimal[(bb+I)..(bb+I+min(fw,nn))]}; I = I+{number of characters consumed}; R = (valid result) ? 0 : 1<\/code><\/p>\n\n\n\n

Extract (Get) a floating point number from a buffer in RAM<\/a>.<\/p>\n\n\n\n

Consider an Xwire receive data block to be nn<\/code> bytes of RAM long, starting at address bb<\/code>. Return a decimal number from the data block, starting at RAM address bb+I<\/code> (i.e. the starting address is indexed). Skip any leading spaces. Process leading + or – sign, if present. Terminate on anything thereafter that’s not a decimal digit or decimal point, or after processing fw<\/code> (field width) characters in total (including spaces, sign and decimal point). Advance I<\/code> past the characters used, leaving it pointing at the terminating character (auto-index). Result in W, NaN if nothing there. R register signals outcome. 0 = OK, 1 = no valid decimal number present.<\/p>\n\n\n\n

Notes:<\/p>\n\n\n\n

    \n
  1. Typically used for receiving ASCII-coded information from an Xwire peripheral board.<\/li>\n\n\n\n
  2. The field width fw<\/code> includes leading spaces, signs and decimal point.<\/li>\n\n\n\n
  3. Conversion will end on the first unexpected character, including a second sign character, a second decimal point or a trailing space. This overrides the field width.<\/li>\n\n\n\n
  4. The valid range for fw<\/code> is 1 to 255. fw<\/code> = 255 disables character counting.<\/li>\n\n\n\n
  5. Anything more than 7 digits of input is meaningless, as the floating point number representation is only accurate to 6 or 7 decimal places. Excess digits will be nevertheless be consumed, up to the limits of nn<\/code> and fw<\/code>.<\/li>\n<\/ol>\n\n\n\n

    Dialect<\/a> exclusions: Not available in dialects before 28<\/p>\n\n\n\n

    See also:\u00a0iifPrintWFW<\/a><\/code>,\u00a0iifPrintWVW<\/a><\/code>,<\/p>\n\n\n\n

    Examples<\/h6>\n\n\n\n

    The following shows the result of the instruction iifGetNum 100,15,8<\/code> for various RAM contents and Values of I<\/code>.<\/p>\n\n\n\n

    Data in RAM, starting at address 100 (Shown as ASCII (printable) characters.<\/strong><\/td>Initial value of I<\/strong><\/td>Result returned in W<\/strong><\/td>Final value of I<\/strong><\/td>Comment<\/strong><\/td><\/tr>
    123.456xxxxxxxx<\/code><\/td>0<\/td>123.456<\/td>7<\/td>Conversion starts at the first character, because I<\/code> = 0. Conversion is terminated by the first x.<\/td><\/tr>
    123.456xxxxxxxx<\/code><\/td>1<\/td>23.456<\/td>7<\/td>Conversion starts at the second character, because I<\/code> = 1.<\/td><\/tr>
    123.456xxxx<\/code><\/td>0<\/td>123<\/td>8<\/td>Leading spaces are counted in the field width. The decimal point “makes it”, and I<\/code> gets left pointing at the 4. A subsequent conversion with the same instruction would return 456<\/td><\/tr>
    -123.456xxxxxxx<\/code><\/td>0<\/td>-123.456<\/td>8<\/td>All good, got it all<\/td><\/tr>
    -123.456xxxxxx<\/code><\/td>0<\/td>-123.45<\/td>8<\/td>The last digit is excluded, because the field width of 8 terminates conversion. Furthermore, a subsequent conversion would return 6.<\/td><\/tr>
    -12.3.456xxxxxx<\/code><\/td>0<\/td>-12.3<\/td>6<\/td>The second decimal point terminates conversion. If the same instruction were executed again (with I<\/code> as-is), it would return 0.456<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

    W = (float){Ascii2Decimal[(bb+I)..(bb+I+min(fw,nn))]}; I = I+{number of characters consumed}; R = (valid result) ? 0 : 1 Extract (Get) a floating point number from a…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2256,"menu_order":7,"template":"","class_list":["post-2317","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\niifGetNum bb#,nn,fw [D>=28] - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"iifGetNum bb#,nn,fw [D>=28] - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"W = (float){Ascii2Decimal[(bb+I)..(bb+I+min(fw,nn))]}; I = I+{number of characters consumed}; R = (valid result) ? 0 : 1 Extract (Get) a floating point number from a...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/communications-instructions\/iifgetnum-bbnnfw-d28\/\" \/>\n<meta property=\"og:site_name\" content=\"SPLat Controls\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-10T06:58:37+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/communications-instructions\/iifgetnum-bbnnfw-d28\/\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/communications-instructions\/iifgetnum-bbnnfw-d28\/\",\"name\":\"iifGetNum bb#,nn,fw [D>=28] - 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