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POTrouble getting an array in sets program (C)
 

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  1. POTrouble getting an array in sets program (C)
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    <p>I am working on a C program that deals with sets, and I am having trouble getting the values for an array in my C program. I am thinking that there is a logical error in the function below. </p> <p>sizeA is 26, and setA is a boolean set of size 26.</p> <p><em>Here is how the function should turn out if sizeA is 5:</em></p> <pre><code>Enter the first element in Set A: //user enters h Enter the next element of Set A: //user enters i Enter the next element of Set A: //user enters j Enter the next element of Set A: //user enters k Enter the next element of Set A: //user enters l fffffftttttffffffffffffff </code></pre> <p><em>However it turns out like this if sizeA is 5:</em></p> <pre><code>Enter the first element in Set A: //user enters h Enter the next element of Set A: //user enters i Enter the next element of Set A: //user enters j Enter the next element of Set A: //user enters k Enter the next element of Set A: //user enters l ffffff </code></pre> <p><strong>I would like to know how to fix this problem.</strong> </p> <p>Here is the code:</p> <pre><code>void getSetA(bool setA[], int sizeA) { letters element, letter; int position = 0, num, i; for(i = 0; i &lt; sizeA; i++) //sizeA is inputted before { setA[i] = FALSE; } printf("\nEnter the first element in Set A: "); element = getcharNoBreaks(); if (element &gt;= 'a' &amp;&amp; element &lt;= 'z') { setA[element-'a'] = TRUE; } for(num = 1; num &lt; sizeA; num++) { printf("\nEnter next element of Set A: "); element = getcharNoBreaks(); if(element &gt;= 'a' &amp;&amp; element &lt;= 'z') { setA[element - 'a'] = TRUE; } else printf("Element out of range"); } printf("\n"); for(i = 0; i &lt; sizeA; i++) { if(setA[i] == TRUE) printf("t"); else printf("f"); } } </code></pre> <p><strong>Note that <code>letters</code>, is a type I have defined (as all the letters of the alphabet), and <code>getcharNoBreaks()</code> is a function that is equivalent to getchar().</strong></p> <p>Thank you :) </p>
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    1. USPaul Filch
    1. USPaul Filch
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    1. COSo now **what** should the function do? "It should print ffffffftttttfffffff but it prints ffffff" is not quite helpful for us...
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      1. POTrouble getting an array in sets program (C)
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    2. CO`puts("fffffftttttffffffffffffff")`
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      1. POTrouble getting an array in sets program (C)
      1. USDrew McGowen
    3. COBut from what I can tell, this code will actually result in undefined behavior, as `setA` (I presume) is an array of only 5 elements, but indexing with `'l' - 'a'` is index 11, which is *clearly* out of bounds.
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      1. POTrouble getting an array in sets program (C)
      1. USDrew McGowen
 

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