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18254652
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0
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2013-08-15T14:17:23.390
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2013-11-01T05:44:29.713
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2017-05-23T12:20:24.487
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You have an <a href="https://stackoverflow.com/questionhttps://stackoverflow.com/questions/671703/array-index-out-of-bound-in-cs/671703/array-index-out-of-bound-in-c">index-out-of bound</a> mistake that causes <a href="http://en.wikipedia.org/wiki/Undefined_behavior" rel="nofollow noreferrer">undefined behavior</a> at runtime: <pre><code>myStudPtr = &myStud[SIZE]; // ^^^^^ // wrong </code></pre> According to declaration <code>struct students myStud[SIZE];</code>, Maximum index value can be <code>SIZE - 1</code>. Remember array index starts with <code>0</code>. Edit As I can understand, you have declared an array of struct, and wants to read <code>i</code> number of student's information from user using pointer to struct. But there are some more problems in your code e.g. in for loop you always access same struct element: <pre><code>for(count = 1; count <= i; count++) scanf("%s", &(*myStudPtr).name); // ^ // points to same struct element in array </code></pre> This mistake is present in every <code>scanf()</code> and <code>printf()</code> statements. Correct will be as follows: <ol> <li>Initialize pointer to the address of first element in array: <pre><code> myStudPtr = &myStud[0]; // ^ first element at 0th index </code></pre></li> <li>Via pointer you can simply access struct's elements in any one of following two ways: First: for example to scan <code>score</code> value of a student: <pre><code>scanf("%d", &myStudPtr[count].score); </code></pre> Note: <a href="http://www.difranco.net/compsci/C_Operator_Precedence_Table.htm" rel="nofollow noreferrer">precedence</a> of <code>[]</code> 'array subscript operator' is higher then <code>.</code> 'member selection via object name operator' so you do not need <code>()</code> parenthesis. Also precedence of <code>.</code> operator is higher then <code>&</code> ampersand operator so even you do not need any parenthesis to get address(for example <code>&(myStudPtr[count].score)</code> not needed). Second: to scan <code>score</code> value of a student using pointer and <code>-></code> operator: <pre><code>scanf("%d", &(myStudPtr + count)->score); </code></pre> Note: <code>+</code> plus operator has lower precedence so we need parenthesis to overwrite precedence. And precedence of <code>-></code> member selection via pointer operator higher then <code>&</code> ampersand operator so here also you do not need any parenthesis like <code>&((myStudPtr + count)->score)</code>. </li> </ol> Important to notes: <ol> <li>You should check entered value of <code>i</code> by user that must be less to <code>SIZE</code> (the size of strcut array) otherwise you may have undefined behavior in your code. </li> <li>To read string use safe <code>fgets()</code> function instead of scanf to avoid buffer overflow. Read: <a href="https://stackoverflow.com/questions/17294809/reading-a-line-using-scanf-not-good/17294869#17294869">"Reading a line using <code>scanf()</code> not good?"</a></li> </ol> One more side note: <ol> <li>As you are new C programmer(I feel) you should read: <a href="http://www.cs.arizona.edu/~mccann/indent_c.html" rel="nofollow noreferrer">Indenting C Programs</a> its a quick tutorial to learn indentation practice. </li> <li>You should always keep space after <code>,</code> and <code>;</code> to make your code readable, and for the same reason an expression like <code>count<=i</code> should be written as <code>count <= i</code>. Compare your for loop: <pre><code> for(count=1;count<=i;count++) </code></pre> And following that I would like to suggest you: <pre><code> for(count = 1; count <= i; count++){ // code after one tab } </code></pre></li> </ol> Improve code: I would also like to suggest you to improve if-else coding style, your if-else part of code can be written as follows: <pre><code>score = myStudPtr->score; if(0 <= score && score <= 100){ if(score > 70) printf("A"); if(60 <= score && score < 69) printf("B"); if(50 <= score && score < 59) printf("C"); if(40 <= score && score < 49) printf("D"); if(score < 40) printf("FAIL"); } else printf("Error: Invalid Entry!"); printf("\n"); </code></pre> <ul> <li>I removed many <code>else</code> statement, instead used &&. </li> <li>Removed redundant <code>{..}</code> braces pairs. </li> <li>Used local <code>score</code> variable instead <code>myStudPtr->score</code> to keep code look simple. </li> <li>Remove <code>\n</code> from each <code>pritf</code> statement instead add a new <code>printf</code> at the end (not very important).</li> </ul> Last mistake: To print each students record you need a new loop within that you call <code>printf()</code> function and includes if-else logic to evaluate student grades. 
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