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  1. PO
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    <p>I see a few problems:</p> <pre><code>try{ int t=Integer.parseInt(br.readLine()); }catch(IOException e){} int[] n=new int[t]; </code></pre> <p>Two problems there:</p> <ol> <li><p><code>t</code> is only declared within the <code>try</code> block. It's out-of-scope outside that block. Thus, a compile-time error trying to use <code>t</code> on the last line above.</p></li> <li><p>Even if you fix that by declaring <code>t</code> outside the block and then initializing it inside the block, the compiler can't be sure that <code>t</code> has a value as of the last line above. An exception may have been thrown instead. So that's an error (a compile-time error).</p></li> </ol> <p>The later, a third issue (at least):</p> <pre><code>for(int i=0;i&lt;n.length;i++) { try { n[i]=Integer.parseInt(br.readLine()); }catch(IOException e){} } </code></pre> <p>This is a logic error. If you try to use <code>n[i]</code> in your later loop, you have no idea whether <code>n[i]</code> has been actually initialized, because you've hidden your exception. For all you know, there was an I/O exception initializing <code>n[2]</code> and so <code>n[2]</code> keeps the default <code>null</code> value. If you try to use it later without checking for that, you'll get a <code>NullPointerException</code>.</p> <p>It's a <strong>really bad idea</strong> to catch and ignore exceptions, particularly doing it repeatedly for specific lines of code like that.</p> <p>Here's a minimal-changes reworking of that <code>main</code>:</p> <pre><code>public static void main(String args[]) { // Put all the code in one try block try { InputStreamReader in=new InputStreamReader(System.in); BufferedReader br=new BufferedReader(in); int t=Integer.parseInt(br.readLine()); int[] n=new int[t]; for(int i=0;i&lt;n.length;i++) { n[i]=Integer.parseInt(br.readLine()); } for(int i=0;i&lt;n.length;i++) { int x=n[i]; BigInteger p = new BigInteger(Integer.toString(x)); p=smallfac.fac(p); System.out.println(p); } }catch(IOException e){ // Report the error here } } </code></pre>
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    1. POrun time initialization of array in java
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    1. UST.J. Crowder
    1. UST.J. Crowder
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    1. COthanku so much.....that was really helpful.
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      1. USAkshay
    2. CO@user1869756: You're welcome! I'm glad that helped!
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      1. UST.J. Crowder
 

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