UVA - 694 - The Collatz Sequence

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=94&page=show_problem&problem=635

题意：

输入数字A，分段函数处理。水

#include <iostream>
#include <stdio.h>

using namespace std;

int main()
{
long long num, A, L;

long long iCase = 0;
while ( 1 )
{
cin >>num >>L;
A = num;
if ( A < 0 && L < 0 )
{
break;
} // end if
iCase++;
long long nTerm = 0;
while ( 1 )
{
if ( A > L )
{
break;
} // end if
else
{
nTerm++;
if ( A == 1 )
{
break;
} // end if
else
{
if ( A%2 == 0 )
{
A = A/2;
} // end if
else
{
A = 3*A+1;
} // end else
} // end else
} // end else
} // end while

cout <<"Case " <<iCase <<": A = " <<num
<<", limit = " <<L
<<", number of terms = " << nTerm
<<'\n';

} // end while

return 0;
}