694 - The Collatz Sequence

#include<stdio.h>

int main(void)
{ long a=0,A=0,l=0,count=0,t=0;

while(scanf("%ld%ld",&a,&l)==2&&(a!=-1)&&(l!=-1)){
count++;
A=a;
t=0;
do{
if(a%2)
{++t;a=3*a+1;}
else
{++t;a=a/2;}
}
while(a!=1&&a<=l);
if(a==1) t++;
printf("Case %d: A = %ld, limit = %ld, number of terms = %ld\n",count,A,l,t);
}
return 0;}