# Given an integer N the task is to print the F(N)th term in C

## Print F(N)th term in C

Here, in this page we will discuss the program to print the F(N)th term in C Programming Language.  A function f is defined as follows F(N)= (1) +(2*3) + (4*5*6) … N. We are given with an integer N and we need to print the F(N)th term

## Method Discussed :

• Method 1 : Using Iteration
• Method 2 : Using Recursion

Let’s discuss the above two methods in brief,

## Method 1 :

• Declare a variable result = 0.
• Run a while loop till current != N+1.
• Inside while loop declare a variable cur to hold the product of the terms and initialize it with 1.
• Now, run a loop to calculate the product of terms till current.
• Set i= calculate. Termination condition of the loop will be i>= calculated + current.
• Inside for loop set cur *= i.
• After execution of for loop set calculated = i, result += curr and increment current value by 1.
• After the execution of while loop return result.

### Method 1 : Code in C

Run
```#include<stdio.h>

//Function to calculate N-th term
int term(int calculated, int current, int N)
{
int i, result = 0;

while(current != N + 1){

int cur = 1;
// product of terms till current
for (i = calculated; i < calculated + current; i++)
cur *= i;

calculated=i;
result += cur;
current++;
}

return result;
}

// Driver Code
int main()
{
int N = 3;

printf("%d ", term(1, 1, N));

return 0;
}

```

```127
```

## Method 2 :

In this method we will use the recursive way of the method 1 algorithm.

### Method 2 : Code in C

Run
```#include<stdio.h>

// Recursive function
int term(int calculated, int current, int N)
{
int i, cur = 1;

// Base Condition
if (current == N + 1)
return 0;

// product of terms till current
for (i = calculated; i < calculated + current; i++)
cur *= i;

return cur + term(i, current + 1, N);
}

// Driver Code
int main()
{
int N = 3;

printf("%d ", term(1, 1, N));

return 0;
}

```

```127
```