【C语言】1-1/2+1/3-1/4……1/n求多项式结果

/*
============================================================================
Name        : Factor.c
Author      : moshiyou@163.com
Version     :
Copyright   : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
float polynomial(int n){
float sum=0;
int i;
for(i=1;i<=n;i++){
if(i%2 == 1)
sum += 1.0/i;
if(i%2 == 0)
sum -= 1.0/i;
}
return sum;

}
int main(int argc,char *argv[]) {
int t;
float sum;
scanf("%d",&t);
sum = polynomial(t);
printf("%f",sum);
return EXIT_SUCCESS;
}