编辑代码

/*#include<stdio.h>
int main(void)
{
	int denominator,flag,i,n;
	double item,sum;

	printf("Enter n:");
	scanf("%d",&n);
	flag=1;
	denominator=1;
	item=1;
	sum=0;
for(i=1;i<=n;i++){
	sum=sum+item;
	flag=-flag;
	denominator=denominator+2;
	item=flag*1.0/denominator;
}
printf("sum=%f\n",sum);
 
return 0;
}*/
#include<stdio.h>
int main(void)
{
	int i,n;
	double product;

	printf("Enter n:");
	scanf("%d",&n);
	product=1;
	for(i=1;i<=n;i++){
		product=product*i;
	}
	printf("product=%.0f\n",product);

	return 0;
}