IBM Mainframe Forum

[Sabreen Khan]

Hi..Im sabreen, a beginner in the language C. Very recently i have started learning about functions and i am having some trouble solving a problem of recursive function.

The problem is :
I have to write a code in which the user will input 2 integers-let them be a=1,b=1. The output should be an arithmetic series in which each number is the sum of the previous 2 numbers. For example, in this case, the 1st two numbers are 1 and 1. The series should be like this :
1 1 2 3 5 8 13 21 34
The series should continue from 1 to 50.

I'm having trouble understanding the recursive function which we have to use to write the codes for this program.

If you can, please help me.
btw, Dick, thanks for your reply to my last post.

[dick scherrer]

You're welcome

Unfortunately, i don't speak "c". . . I've solved similar requirements in other languages, but they did not have a built-in function for recursion (we wrote our own). Probably wouldn't help as you want to learn to use the built-in function.

d

[pcdoctor]

This is a normal Fibonacci series program..U necessarily need not use recursion to implement this..Google for fibonacci series using c and ull get it..If u still find difficult to undstand then post here..

[dick scherrer]

Hello,

I believe the goal was to use recursion. Solving the calculation was merely something to do that would allow the use of the recursion function. If i understood correctly. . . which i might not

[Sabreen Khan]

hey...thanx...bt i tried and tried and i finally got the solution for fibonacci function using recursion functin..

[dick scherrer]

You're welcome

If you post your solution, it may help someone with a similar question later.

d

[Sabreen Khan]

#include<stdio.h>
#include<conio.h>



int rec(int previous,int result)
{
int sum;
if (result<50)
{
sum= result+previous;
previous=result;
result=sum;
printf("%d ",result);
rec(previous,result);
}
return;

}

main()
{
int previous=0;
int result=1;
rec(previous,result);

}

[dick scherrer]

Thank you

d

[darvin13]

my problem:
i have to write a code using recursive function about arithmetic series, the user will input two integers the length of the output and the difference, the output must start to 2.

example:

length: 5 //this is not fixed
difference: 2 //this is not fixed

the output must be: 2 4 8 32 256

[darvin13]

im darvin..
i need the codes later..
thanks