请帮忙看一下这题 用C++ 怎么做 在线等

[wangxl3]

计算`1到`100的立方根，将结果存于外存，文件名字为root.c

近似计算cos(X)=1-2!分之X的平方+4!分之X的4次方-6!分之X的6次方........(X为弧度。计算精度为10的负6次方)

[liliangbao]

1如下：

#include <iostream>
#include <stdlib.h>

using namespace std; 

int main() 
{
    FILE *pf = NULL;
    pf = fopen("root.c","w");
    if(NULL == pf)
    {
        cout<<"root.c 不能打开!"<<endl;
        exit(1);
    }
    
    for(int i = 1;i <= 100;i++)
    {
        fprintf(pf,"%f\n",pow((double)i,(double)1/3));
    }
    fclose(pf);       

    system("PAUSE");
    return 1;
} 

[HelloDan]

#include <iostream>
#include<cmath>
using namespace std;


int main()
{
  double x=3.1415926/4;    //
  double result=1.0;
  
  double precise=1.0;
  double previous=0.0;  
  double num=2.0;
  double divide=1/2.0;
 
  while(precise>0.000001)
  {
	divide=(-1.0)*divide;
    result=result+divide*pow(x,num);
	cout<<"result="<<result<<endl;
	
	divide=divide/(num+1.0)/(num+2.0);
	num=num+2.0;
	precise=fabs(result-previous);
	previous=result;
  }
	
  cout<<"result="<<result<<endl;
  return 0;
}

[ysysbaobei]

顶