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POCommon macro to read input data and check its validity
 

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  1. POCommon macro to read input data and check its validity
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    <p>I saw on Stack Overflow that many similar questions are repeated and they are related to the reading of one input data item from <strong>stdin</strong> and check its validity.</p> <p>The data could be integer <code>"%d"</code>, double <code>"%f"</code>, string <code>"%s"</code>, unsigned int <code>"%u"</code>...</p> <p>And I want to develop a common macro which could be used for the <strong>majority</strong> of these questions.</p> <p><strong>Example 1 of questions</strong></p> <p>The OP could ask:</p> <ul> <li>scan the input data</li> <li>the data should be integer so <code>11a</code>, <code>aaa</code>, <code>aa44</code>,... inputs are not allowed. Only integer followed with a white space (refer to <a href="http://www.cplusplus.com/reference/cctype/isspace/" rel="nofollow">isspace()</a>) is allowed</li> <li>other conditions could be present in the question like: input integer should be <code>&gt;3</code> and <code>&lt;15</code></li> </ul> <p><strong>Example 2 of questions</strong></p> <p>The OP could ask:</p> <ul> <li>scan the input data</li> <li>the data should be double so <code>11.2a</code>, <code>aaa</code>, <code>aa44.3</code>,... inputs are not allowed. Only double followed with a white space (refer to <a href="http://www.cplusplus.com/reference/cctype/isspace/" rel="nofollow">isspace()</a>) is allowed</li> <li>other conditions could be present in the question like: input double should be <code>&gt;3.2</code> and <code>&lt;15.0</code></li> </ul> <p>Is it possible to develop a common macro like</p> <pre><code>#define SCAN_ONEENTRY_WITHCHECK(FORM,X,COND) // FORM: format of the input data like "%d", "%lf", "%s" // X: address where to store the input data // COND: condition to add in the check of the input data .... // example of calling the macro in the main() int a; SCAN_ONEENTRY_WITHCHECK("%d", &amp;a,(a&gt;3 &amp;&amp; a&lt;15)) </code></pre> <p>The macro should scan the data and IF one of the following criteria is not true then print a message to the user asking him to enter again. and repeat that until the user enters valid data?</p> <p>Criteria:</p> <ul> <li>input data type should be the same indicated by format</li> <li>input data should be followed by white space indicated in the <a href="http://www.cplusplus.com/reference/cctype/isspace/" rel="nofollow">isspace()</a></li> <li>input data should be valid the condition <code>COND</code></li> </ul>
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    1. COThis is a well-intentioned post, but it's not a great fit for the Q&A format of this site. It seems more like a blog post ("let me share some code I've written") than a legitimate question.
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      1. USJohn Kugelman
    2. COI know this question could looks like a blog post. But there is useful informations which could be useful for the SO users especially that similar questions is repeated many times in the SO. and I want to share it with the SO users. so I choose to present it as Q&A in the SO
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    3. CO@JohnKugelman `I saw in the stackoverflow that many similars questions are repeated and they are related to the reading of a one input data from stdin (with scanf()) and check its validity.` and I want to provide common solution for theses question. this could be useful for such questions in the future.
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