test5.c

有关C的训练题

#include "stdio.h"
double fun(double x,int n);
long fact(int n);
double power(double x,int n);
void main()
{
	double x;
	int n;
	printf("Input double:");
	scanf("%lf",&x);
	printf("Input integer:");
	scanf("%d",&n);
	printf("Result=%lf\n",fun(x,n));
	return ;
}

double fun(double x,int n)
{
	double result=0;
	int i;
	for(i=0;i<=n;i++)
		result+=power(x,i)/fact(i);
	return result;

}
/*计算阶乘*/
long fact(int n)
{
	long result=1;
	int i;
	for(i=1;i<=n;i++)
		result*=i;
	return result;
}
/*计算x的n次方*/
double power(double x,int n)
{
	double result=1;
	int i;
	for(i=1;i<=n;i++)
		result=result*x;
	return result;
}