Question

用C语言计算：x方减3x加二等于0,取值在区间0.5到1.5之间用二分法怎么做

Answer 1

#include <stdio.h>
double f(double x)
{
    return x*x-3*x+2;
}
int main()
{
    double low=0.5,high=1.5,middle;
    middle=(low+high)/2;
    while(f(middle)>0.00001 ||f(middle)<-0.00001)
    {
        if(f(low)*f(middle)<0)
            high=middle;
        else
            low=middle;
        middle=(low+high)/2;
    }
    printf("The root of x*x-3x+2=0 is %lf\n",middle);
    return 0;
}