Hailstone Series

3,10,5,16,8,4,2,1,4,2,1......................... is a series called 'Hailstone series'. It is a mathematical series in which the first number is checked for Even or Odd. If the number is odd, next number is 3 times plus 1 [(ax3)+1], and if the number is Even, next number is half of that number (a/2). Eventually, the series comes to end at 1.
#include<stdio.h>
#include<conio.h>
int main()
{
int x=3, i;
printf("Hailstone Series:\n");
for(i=1;i<=15;i++)
{
printf("%d\t",x);
if(x % 2==0)
x=x/2;
else
x=(x*3)+1;
}
getch();
}

Fibonacci Series

WAP to display the given series: 1,1,2,3,5,8,13,21,34,55............. up to 15th terms. It is a series which is called 'Fibonacci'. In fibonacci series first(starting) two numbers are added to get the third number. and this continues till the last term.
Here is an example C program for finding 'Fibonacci' series.
#include<stdio.h>
#include<conio.h>
int main()
{
int i, a,b,c;
a=1;
b=1;
printf("Fibonacci Series\n");

for(i=1;i<=15;i++)
{
printf("%d\n",a);
c=a+b;
a=b;
b=c;
}
getch();
}