顺便帮忙看看哪里错了，写了，写份正确的给我吧

# include<stdio.h>
# include<math.h>
int main(void)
{
    double e,cosx,x;
    double funcos(double e,double x);
    printf("Enter e:");
    scanf("%lf",&e);
    printf("Enter x:");
    scanf("%d",&x);
    cosx=funcos(e);

    printf("cosx=%.4f\n",cosx);
    return 0;
}
double funcos(double e)
{
    int flag,i,n,j,x;
    double item,sum,power,result;
    for(i=0;i<=n;i=i+2){
        power=pow(x,i);
    }

    for(j=0;j<=n;j=j+2){
        result=result*j;
    }
    flag=1;
    item=1.0;
    sum=0;
    while(fabs(item)>=e){
        item=flag*power/result;
        sum=sum+item;
        flag=-flag;
        result=result+2;
    }
    return 0;
}

#include<stdio.h>
#include<math.h>
int main(void)
{
    double e,x,cos;
    double funcos(double e,double x);
    printf("请输入精度值e及x的值:");
    scanf("%lf%lf",&e,&x);
    cos=funcos(e,x);
    printf("cos%lf=%lf\n",x,cos);

    return 0;
}
double funcos(double e,double x)
{
    int flag,n;
    double sum,y,M,item;
    double fact(int n);
    flag=1;
    M=1;
    n=0;   
    y=0;
    sum=0;
    while(fabs(item)>=e){
       
        item=flag*pow(x,y)/M;
        flag=-flag;
        sum=sum+item;
        y=y+2;
        n=n+2;
        M=fact(n);
    }
    return sum;
}
double fact(int n)
{
    int i;
    double product;
    product=1;
    for(i=1;i<=n;i++){
        product=product*i;
    }
    return product;
}

如此就好

谢了！