Reverse coding

Hi friends...

lets crack some codes..

Following are some sample inputs and outputs.Find the logic and make the code

sample:

try it yourself

here is the answer:

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{

start:

long int input,i;

long  mul=1;

long double result;

cout<<"\nEnter a positive number:";

cin>>input;

for(i=1;i<=input;i++)

{

mul=mul*input;

}

result=2.303*log10(mul);

cout<<result;

goto start;

}