[課業] 請問各位一個國考程式題目
※ [本文轉錄自 Examination 看板]
作者: fjf1980 (Yes We Can!) 看板: Examination
標題: [課業] 96地特/程式語言/泰勒展開
時間: Mon Oct 26 19:33:45
4.想問的內容：
題目：f(x)=1- x/2! + x/4! -x/6!...
每項算法為si = (-1)^i * x^2i / 2i!
題目要求設計把引數x先模數到 0<= x <2*pi, 然後用級數計算f(x)相加
準確到項數|Sn|<10^-8
5.想法：下面是我在DEV-C++實際跑程式，可是不管我x換多少，
我的答案都是1.000000 = = 買尬！ 為什麼？
#include <stdio.h>
#include <stdlib.h>
#define pi 3.14159
double sn(int x)
{
double result=0.0;
double temp=0.0;
int i=0;
while(temp<0.00000001 && temp >-0.00000001)
{
temp = pow(-1,i)*pow(x*pi,2*i)/fact(2*i);
i++;
result += temp;
}
return result;
}
int fact(int x)
{
if(x==0 || x==1)
return 1;
else
return x*fact(x-1);
}
int main(int argc, char *argv[])
{
double x=1.1;
double input_x=0.0;
x = x-((int)(x/2.0)*2.0);
printf("%f\n",sn(x));
system("PAUSE");
return 0;
}
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.230.197.214
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.230.197.214
→
10/26 20:02, , 1F
10/26 20:02, 1F
※ 編輯: fjf1980 來自: 61.230.197.214 (10/26 20:03)
推
10/26 20:09, , 2F
10/26 20:09, 2F
→
10/26 20:12, , 3F
10/26 20:12, 3F
推
10/26 20:18, , 4F
10/26 20:18, 4F
→
10/26 20:18, , 5F
10/26 20:18, 5F
→
10/26 20:19, , 6F
10/26 20:19, 6F
→
10/26 20:19, , 7F
10/26 20:19, 7F
→
10/26 20:19, , 8F
10/26 20:19, 8F
→
10/26 20:20, , 9F
10/26 20:20, 9F
→
10/26 20:20, , 10F
10/26 20:20, 10F
→
10/26 20:21, , 11F
10/26 20:21, 11F
→
10/26 20:21, , 12F
10/26 20:21, 12F
→
10/26 20:22, , 13F
10/26 20:22, 13F
→
10/26 20:22, , 14F
10/26 20:22, 14F
推
10/26 20:24, , 15F
10/26 20:24, 15F
推
10/26 20:27, , 16F
10/26 20:27, 16F
→
10/26 20:28, , 17F
10/26 20:28, 17F
→
10/26 20:32, , 18F
10/26 20:32, 18F
推
10/26 20:42, , 19F
10/26 20:42, 19F
→
10/26 21:01, , 20F
10/26 21:01, 20F
推
10/26 21:06, , 21F
10/26 21:06, 21F
→
10/26 21:31, , 22F
10/26 21:31, 22F