Question

编程：输入x值，按下列公式计算cos(x):cos(x)=1-x^2/2!+x^4/4!-x^6/6!+……

c语言刚刚入门啊！！期望得到帮助

Answer 1

#include<stdio.h>

void main()
{
double x,t=-1,i,cos=1,fz=1,fm=1;
printf("Input X:");
scanf("%lf",&x);
for(i=2;i<=18;i+=2)
{
fz*=x*x;
fm*=(i-1)*i;
cos+=t*fz/fm;
t=-t;
}
printf("cos(%lf)=%lf\n",x,cos);
}