第三周项目2—太乐了

#include <iostream>using namespace std;const double pi=3.1415926;double mysin(double);double myabs(double);int main( ){    cout<<"sin(π/2)的值为"<<mysin(pi/2)<<endl;    cout<<"sin(56°)的值为"<<mysin((56.0/180)*pi)<<endl;   return 0;}double mysin(double x){    double sum=x,num=x,term;    int n=1,den=1,sign=1;   do    {        den=den*(n+1)*(n+2);        num=x*x*num;        sign=-sign;        term =num/den*sign;        sum=term+sum;        n=n+2;    }    while(myabs(term)>1e-5);    return sum;}double myabs(double x){    return ((x>=0)?x:-x);}

运行结果：

知识点总结：自定义函数解决问题

学习心得：数学是硬伤啊