C语言 求方程ax2 bx c=0的实数根.

#includedoublefunc(doublex){returnx*(x-3.0)-5.0;}doublebinary_search(doublex1,doublex2,double(*f)(do

#include#includevoidmain(){floatc,d,f,a,b;a=-10;b=10;while(fabs(a-b)>=0.000001){c=(a+b)/2;d=2*a*a*a-

程序流程分析：①赋值x0＝1.5,即迭代初值；②用初值x0代入方程中计算此时的f(x0)及f’(x0),程序中用变量f描述方程的值,用fd描述方程求导之后的值；③计算增量d=f/fd；④计算下一个x,

#includevoidmain(){floats,f0,h,x;intn,i;printf("inputn:");scanf("%d",&n);h=1.0/n;f0=4.0;s=0.0;for(i=

#include <stdio.h> #include <math.h>//

#include <stdio.h>#include <assert.h>double f(double x){  

这道题其实很简单的,就只是三个if而已吧,你就根据求根公式编写就行.可能求虚根难点.这些要求和提示已经很详细了,除非你没学过c语言.再问：我不是不懂，是a,b,c,x1,x2,disc=b*b-4*a

#include#includemain(){doublea,b,c,x1,x2;printf("Inputa,b,c:\n");scanf("%lf%lf%lf",&a,&b,&c);{if(a=0

#include#include"math.h"usingnamespacestd;doublefangcheng(doublea,doubleb,doublec){if(b*b-4*a*c>=0)

第一个地方：doubley1=(-b+sqrt(b*b-4*a*c))/(2*a);doubley2=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x的值为%lf或者%lf",

#include#includeintmain(){floata,b,c;floatx1,x2;scanf("%f%f%f",&a,&b,&c);if(b*b-4*a*c

#include#include#defineDeltab*b-4*a*cintmain(){floatx1,x2;inta,b,c;scanf("%d%d%d",&a,&b,&c);x1=(-b+(

x1,x2请输入-10,10#include#includevoidmain(){floatx0,x1,x2,f0,f1,f2;do{printf("pleaseenterx1&x2:\n");sca

#include#includedoubleeps=10E-6;doublef(doublek)//原函数方程{returnlog10(k)+k-2.0;}doubleget(doublek){ret

intf(floatx)返回值,错了.

#includmain(){inta,b,c;floatm,n,k,l,p,q;chars;s='i';printf("inputabc:/n");scanf("%d%d%d",&a,&b,&c);i

很简单的#include#includevoidf1(doublea,doubleb,doublec){cout

#include"stdio.h"#include"math.h"main(){doublea,b,c,x1,x2,dt,p,q;printf("pleaseinputa,b,c:");scanf("

刚才那个只能找一个根,现在改了下,可以找所有根:刚才有个小BUG,改了下::#includevoidFindRoot(void){doubledbLeftX=-10.0;doubledbRightX=

#include#include#defineeps5e-6#definedelta1e-6#definee2.718floatbisection(floata,floatb,float(*f)(fl