牛顿法求方程的根，y=ln（x+3），初始值为x0=1，值不对，但不知道错哪里了

Question

include

include

include

define e 2.714

int main ()
{
double a,b;
b=1;
a=b-(log(4)*4);
while (fabs(b-a)>1*e-6)
{
b=a;
a=b-log(b+3)/(1/(b+3));
}
printf("a=%ld");

Answer 1

http://wenku.baidu.com/link?url=yV2LCCLR5sPqXZsgvzr__jNfPuSj5YtxuHj9pzkT92PdUw9_KKY1-G9QSbOe17Nqjc5KrqRk2gZWkrpd7xeYL3PhMQwG6ROta_M1Wm6t7ba