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#include

#include

#define PI 3.1415927

double FACT(double x);

double fact(int n);

int main()

{

int n,i,k,flag;

double x,sin,temp,index;

while(scanf("%lf%d",&x,&n)!=EOF)

{

FACT(x);

flag=1; index=0.1; temp=x; sin=0;/*初始化数据*/

for(i=1;i

index*=index; /*计算出10的-n次方*/

i=1;

while(fabs(temp)>=index) /*判断循环条件*/

{

temp=flag*x/fact(i); /*先计算x/i！*/

for(k=0;k

temp*=x;

sin+=temp; /*加到sin*/

flag=-flag; /*符号变换*/

i+=2;

}

printf("%.*f\n",n,sin); /*输出*/

}

return 0;

}

double fact (int n) /*调用阶乘函数*/

{

double result;

if(n==1||n==0)

result=1;

else

result=n*fact(n-1);

return result;

}

double FACT(double x)

{

while(x>PI/2||x

x-=2*PI;

return x;

}