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    <p>Here are a few pointers besides the most important one of initializing <code>found[]</code>, which was mentioned in other comments.</p> <p>the <code>alpha[]</code> array complicates things, and you don't need it. See below for a modified file-read-loop that doesn't need the <code>alpha[]</code> array to count the letters in the file.</p> <p>And strictly speaking, the expression you're using to initialize the <code>alpha[]</code> array:</p> <pre><code>alpha[i] = 'A' + i++; </code></pre> <p>has undefined behavior because you modify <code>i</code> as well as use it as an index in two different parts of the expression. The good news is that since you don't need <code>alpha[]</code> you can get rid of its initialization entirely.</p> <p>The way you're checking for <code>EOF</code> is incorrect - it'll result in you acting on the last character in the file twice (since the <code>fscanf()</code> call that results in an <code>EOF</code> will not change the value of <code>ch</code>). <code>feof()</code> won't return true until <em>after</em> the read that occurs at the end of the file. Change your <code>ch</code> variable to an <code>int</code> type, and modify the loop that reads the file to something like:</p> <pre><code>// assumes that `ch` is declared as `int` while ( (ch = fgetc(fin)) != EOF ) { if ( isalpha(ch) ) { count += 1; ch = toupper(ch); // the following line is technically non-portable, // but works for ASCII targets. // I assume this will work for you because the way you // initialized the `alpha[]` array assumed that `A`..`Z` // were consecutive. int index = ch - 'A'; found[index] += 1; } } </code></pre>
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    1. COI really like your suggestion here because I hate using while loops if I can afford not to, and you've explained how to free up 12 lines of needless code. I understood how subtracting the characters returned the integer value of distance, but I was having a hard time knowing the proper syntax for incrementing the array entry. Thank you! (PS - It seems to have also resolved my crashing problem as well)
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