查错...

[daheixiong]

正确的和错误的比较,两段代码我看是一样的,只有借助各位的法眼了.

[jomly]

up

[用户 昵称]

1)
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x2*((2*x2-4)*x2+3)-6; //here
2)
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x1*((2*x1-4)*x1+3)-6; //and here

[langziji]

1. do
{
printf("Enter x1 & x2:");
scanf("%f,%f",&x1,&x2);
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x2*((2*x2-4)*x2+3)-6;
}while (fx1*fx2>0); //here
2. do
{
printf("Enter x1 & x2:");
scanf("%f,%f",&x1,&x2);
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x1*((2*x1-4)*x1+3)-6;
}while (fx0*fx1>0);//and here

[daheixiong]

to JennyVenus():谢谢。
to langziji(IT的民工):这样写正确，请查书。

[daheixiong]

正确的:
#include <stdio.h>
#include <math.h>

main()
{
float x0,x1,x2,fx0,fx1,fx2;

do
{
printf("Enter x1 & x2:");
scanf("%f,%f",&x1,&x2);
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x2*((2*x2-4)*x2+3)-6;
}while (fx1*fx2>0);

do
{
x0=(x1+x2)/2;
fx0=x0*((2*x0-4)*x0+3)-6;
if((fx0*fx1)<0)
{
x2=x0;
fx2=fx0;
}
else
{
x1=x0;
fx1=fx0;
}
}while (fabs(fx0)>=1e-5);

printf("x=%6.2f\n",x0);
}


错误的:
#include <stdio.h>
#include <math.h>

main()
{
float x0,x1,x2,fx0,fx1,fx2;

do
{
printf("Enter x1 & x2:");
scanf("%f,%f",&x1,&x2);
fx1=x1*((2*x1-4)*x1+3)-6;
fx2=x1*((2*x1-4)*x1+3)-6;
}while (fx0*fx1>0);

do
{
x0=(x1+x2)/2;
fx0=x0*((2*x0-4)*x0+3)-6;
if(fx0*fx1<0)
{
x2=x0;
fx2=fx0;
}
else
{
x1=x0;
fx1=fx0;
}
}while (fabs(fx0)>=1e-5);

printf("x=%6.2f\n",x0);


}