Write a program that reads a number N and approximates the value of e by the following partial sum: \(\sum_{n=0}^{N}\frac{1}{n!}=2+\frac{1}{2}+\frac{1}{3!}+ \cdots + \frac{1}{N!}\)

Difficulty level
This exercise is mostly suitable for students 
#include<stdio.h>
#include<conio.h>
void main() {

	int N, i;
	double u,s;
	
	do{
		printf("Enter N: ");
		scanf("%d",&N);
	}while(N<=0);
	
	s=u=1;
	for(i=1;i<=N;i++) 
	{
		u=u/i;
		s=s+u;
	}
	printf("e = %lf\n",s);

	getch();
}
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