c语言编程二分法.doc

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1、#include#include#includedoublefun(doublex){returnx*x*x+4*x*x-10;}doubleroot(doublez,doubley,doublee){doublea,b,x;a=z;b=y;if(fun(a)*fun(b)>0){printf("Çø¼äÓÐÎó");}elseif(fun(a)==0){printf("%f",a);}elseif(fun(b)==0){printf("%f",b);}elsedo{x=(a+b)/2;if(fun(a)*fun(x)<0

2、)b=x;elsea=x;}while(fabs(b-a)>e);returnx;}intmain(){doublel,m,n;scanf("%lf%lf%lf",&l,&m,&n);doublex=root(l,m,n);printf("%lf",x);return0;}