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POSPOJ ADDREV Problem
 

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    <p>I did go through the other threads on this <a href="http://en.wikipedia.org/wiki/SPOJ" rel="nofollow noreferrer">SPOJ</a> problem, <a href="https://www.spoj.pl/problems/ADDREV/" rel="nofollow noreferrer">ADDREV</a> (<em>Adding Reversed Numbers</em>), but sadly, I was not able to get an answer by any of the three programs that I have written (in C, Python and Java). I am attaching the code snippets of all three.</p> <p>Python:</p> <pre><code> def find_rev(a): d=0 while(a&gt;=1): d=d*10+a%10 a=a/10 return d n=input('enter a number') for i in range(int(n)): num1=input('enter the first number') num2=input('enter the second number') num=0 num1=find_rev(int(num1)) num2=find_rev(int(num2)) num=num1+num2 num=find_rev(num) print num </code></pre> <p>With Python, I get a runtime error.</p> <p>With C, I get a wrong answer.</p> <pre><code> #include&lt;stdio.h&gt; long rev(long); int main() { long int n; long int n1; long int n2; long int i=0; scanf("%ld",&amp;n); //printf("%d",n); for (i=0;i&lt;n;i++) { //printf("\n%d",i); //printf("\nenter the two numbers"); scanf("%ld%ld",&amp;n1,&amp;n2); n = rev(rev(n1)+rev(n2)); printf("%ld\n",n); } return 0; } long rev(long a) { long d=0; while(a&gt;=1) { d = d*10+a%10; a = a/10; } return d; } </code></pre> <p>With Java, I get a compilation error.</p> <pre><code> import java.util.*; //import java.io.*; public class spoj_prob { public static void main(String args[]) { long n=0; System.out.println("enter a number \n"); Scanner in=new Scanner(System.in); n=in.nextLong(); long n1=0; long n2=0; long sum=0; for (int i=0; i&lt;n; i++) { System.out.println("enter two numbers \n "); n1=in.nextLong(); n2=in.nextLong(); n1=rev(n1); n2=rev(n2); System.out.println(n1); System.out.println(n2); sum=rev(n1+n2); System.out.println(sum); } } static long rev(long a) { long d=0; while (a&gt;=1) { d=d*10+a%10; a=a/10; } return d; } } } </code></pre> <p>Of course, those errors are reported by the SPOJ Judge. The programs work fine on my system. Test cases I use are:</p> <pre><code> 2 999999999 11 999 11 </code></pre> <p>Answer</p> <pre><code> 101 101 </code></pre> <p>Also</p> <pre><code> 3 34 54 123 091 00034 00054 </code></pre> <p><strong>Update</strong>: <strong>Guys, I got the answer in C</strong>. Thank you for all the help.</p>
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    1. COUmm, 999999999 + 11 is 1000000010. That doesn't reverse to 101 so you should be failing your own test case.
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    2. COyeah i corrected that :( . embarassing mistake. now its giving the correct output . on my computer that is.
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