泰勒法计算sin和cos值

本文主要是介绍泰勒法计算sin和cos值，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

#include <stdio.h> 
#define pie 3.14 
double myabs(double n);  
double mysin(double x);  
double mycos(double x);  
main()  
{  int choose;  double result,jiaodu;  while(1)  {  printf("************\n");  printf("sin运算请选1\n");  printf("cos运算请选2\n");  printf("要退出请按0!\n");  printf("************\n");  scanf("%d",&choose);  if (choose==0)  break;  switch(choose)  {  case 1:  {  printf("请输入要计算sin角度值\n");  scanf("%lf",&jiaodu);  result=mysin(jiaodu*pie/180);  break;  }  case 2:  {  printf("请输入要计算cos角度值\n");  scanf("%lf",&jiaodu);  result=mycos(jiaodu*pie/180);  break;  }  }  printf("计算结果为：%f\n",result);  }  
}  
double myabs(double n)  
{  if (n<0)  n*=(-1);  return (n);  
}  
double mysin(double x)  
{  int i=1,sign=1;  double item=x,frac=0,fz=x,fm=1;  for (;myabs(item)>=10E-5;i+=2)  {  frac+=item;  fz=fz*x*x;  fm=fm*(i+1)*(i+2);  sign=-sign;  item=sign*(fz/fm);  }  frac+=item;  return (frac);  
}  
double mycos(double x)  
{  int i=0,sign=1;  double item=1,frac=0,fz=1,fm=1;  for (;myabs(item)>=10E-5;i+=2)  {  frac+=item;  fz=fz*x*x;  fm=fm*(i+1)*(i+2);  sign=-sign;  item=sign*(fz/fm);  }  frac+=item;  return (frac);  
}  

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