牛顿迭代法求平方根.doc

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1、#include#includedoublea;doublef(doublex){doubley;y=x*x-a;returny;}doublef1(doublex){doubley;y=2.0*x;returny;}doubleh(doublex,doubleep,intflag,intnmax){intk;doublex0,g;flag=1;k=1;while((fabs(x-x0)>ep)&&(k

2、/g;k=k+1;}if(k>=nmax)flag=0;returnx;}voidmain(){printf("inputa:");scanf("%lf",&a);intflag,nmax;doublex,ep;ep=0.;nmax=300;x=1;x=h(x,ep,flag,nmax);if(flag==0)printf("thenewtonmethodisfailure");elseprintf("theroofoff(x)is%f",x);}