Question

这是一道C程的题目：输入精度e,用下列公式求cos x的近似值,精确到最后一位的绝对值小于e.

Answer 1

#include

#include

main ()

{

double e,x;

double cosx(double x);

scanf("%lf%lf",&e,&x);

printf("%fn",cosx(x));

return 0;

}

double cosx(double x)

{

int i,flag;

double e,sum,item;

double function(int i);

flag=1;

i=0;

sum=0;

while(fabs(item)>e){

item=flag*pow(x,i)/function(i);

sum=sum+item;

flag=-flag;

i=i+2;

}

return sum;

}

double function(int i)

{

int a;

double fact;

fact=1.00;

for(a=2;a