Question

编写程序，（C语言）求一元二次方程ax的2次方+bx+c=0的根

Answer 1

#include <stdio.h>
#include <math.h)
#define ESSP 0.00000001
void main()
{
double a,b,c,delta,root1,root2;
printf(\"Please input a:\");
scanf(\"%lf\",&a);
printf(\"Please input b:\");
scanf(\"%lf\",&b);
printf(\"Please input c:\");
scanf(\"%lf\",&c);
delta=b*b-4*a*c;
if(delta<-ESSP)
printf(\"This equation has no real root.\");
elseif(delta>ESSP)
{
root1=(-b+sqrt(delta))/(2*a);
root2=(-b-sqrt(delta))/(2*a);
printf(\"This eqution has two unequalize roots:,%lf,%lf\",root1,root2);
}
else
{
root1=-b/(2*a);
printf(\"This eqution has two equalize roots:,%lf\",root1);

}
}