Question

Write C code for this, using pico text editor

3. A sequence an is given with the following rule: an+2 a1 =-1 Write a C program to compute a17

Answer 1

#include<stdio.h>
//given
//a(n+2) = -2*a(n+1)+3*a(n)
//a(n) = -2*a(n-1)+3*a(n-2) // both are equivallent...
int a(int n)// function that finds a17
{
   if(n==0)
   return 2;/// for a0 value is 2
   if(n==1)
   return -1;// for a1 value is -1
  
   return -2*a(n-1)+3*a(n-2);//recursive call
}

int main()
{
   int n =17;
  
   int c = a(17);//finging a17 value by function calling
  
   printf("%d\n",c);//printing result...
  
  
   return 0;
}

output:

-96855121

Process exited normally.
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