codeing question

TCS Ninja National Qualifier Test | Slot Analysis

 

Consider the following series: 1,1,2,3,4,9,8,27,16,81,32,243,64,729,128,2187…

This series is a mixture of 2 series – all the odd terms in this series form a geometric series and all the even terms form yet another geometric series. Write a program to find the Nth term in the series. 

The value N in a positive integer that should be read from STDIN. The Nth term that is calculated by the program should be written to STDOUT. Other than value of n th term,no other character / string or message should be written to STDOUT. For example , if N=16, the 16th term in the series is 2187, so only value 2187 should be printed to STDOUT.You can assume that N will not exceed 30.

Answer:

#include <stdio.h>

#include <math.h>

int main()

{

 

int n;

scanf(“%d”, &n);

if(n % 2 == 1)

{

int a = 1;

int r = 2;

int term_in_series = (n+1)/2;

int res = pow(2, term_in_series – 1);

printf(“%d “, res);

}

else

{

int a = 1;

int r = 3;

int term_in_series = n/2;

int res = pow(3, term_in_series – 1);

printf(“%d “, res);

}

return 0;

}