jishu.c

计算级数 ex=1+x+x2/2!+x3/3!+...+xn/n! 的值

main()
{
    int m,n;
    float x,term,ex1,ex2;
    printf("x,m=");
    scanf("%f %d",&x,&m);
    ex1=ex2=1;
    term=1;
    for(n=1;n<=m;n++)
    {
        term*=x/n;
        ex1+=term;
    }
    ex2=term;
    for (n=m;n>=1; n--)
    {
        term*=n/x;
        ex2+=term;
    }
    printf("exforward=%f exbackrard=%f\n",ex1,ex2);
}