Zzuli:1040 sum of sequence 1

Title Description

Enter an integer n, Output sequence 1+1/3+1/5+…… front n Sum of items .

Input

Enter only one positive integer n.

Output

The result is reserved 2 Decimal place , Take a line alone

The sample input Copy

3

Sample output Copy

1.53

#include <stdio.h>
int main()
{
	int n,i;
	double t,den=1,sum=0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		t=1/den;
		sum=sum+t;
		den=den+2;
	}
	printf("%.2lf",sum);
	return 0;
}