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POMaking a queue program
 

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  1. POMaking a queue program
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    <p>Can someone help me making a queue program. I want to set the <code>array[0]</code> to be <code>array[1]</code> just in display but in real I am adding value at <code>array[0]</code>. I got how to run the add function to it, but I can't do the view and delete command that will view from ex. array[0] to array[4], when displayed array[1] to array[5] with the value inserted. </p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #define p printf #define s scanf int rear = 0; int front = 0; int *q_array = NULL; int size = 0; main() { int num, opt; char cont[] = { 'y' }; clrscr(); p("Queue Program\n\n"); p("Queue size: "); s("%d", &amp;size); p("\n"); if(size &gt; 0) { q_array = malloc(size * sizeof(int)); if(q_array == NULL) { p("ERROR: malloc() failed\n"); exit(2); } } else { p("ERROR: size should be positive integer\n"); exit(1); } while((cont[0] == 'y') || (cont[0] == 'Y')) { clrscr(); p("Queue Program"); p("\n\nQueue size: %d\n\n", size); p("MAIN MENU\n1. Add\n2. Delete\n3. View"); p("\n\nYour choice: "); s("%d", &amp;opt); p("\n"); switch(opt) { case 1: if(rear==size) { p("You can't add more data"); } else { p("Enter data for Queue[%d]: ", rear+1); s("%d", &amp;num); add(num); } break; case 2: delt(); break; case 3: view(); break; } p("\n\nDo you want to continue? (Y\/N)"); s("%s", &amp;cont[0]); } } add(int a) { q_array[rear]=a; rear++; } delt() { if(front==rear) { p("Queue Empty"); } else { p("Queue[%d] = %d removed.", front, q_array[front]); front++; } } view() { int i; for(i=front;i&lt;=rear;i++) p("\nQueue[%d] = %d", i, q_array[i]); } </code></pre>
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    1. USJonathan Leffler
    1. USseventhief
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      1. LTLinked
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    1. COSo what output do you get, and what did you expect to get instead?
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      1. USUseless
    2. CODon't use stuff like `#define p printf`! It's ineffective as an obfuscation, but it makes the code harder to read.
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      1. POMaking a queue program
      1. USDaniel Fischer
    3. COIt is easier and more correct to type `perror( ` than `p( "ERROR`. Errors messages belong on stderr, and should include system error messages. Please use `perror`.
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      1. POMaking a queue program
      1. USWilliam Pursell
 

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