求二元一次方程的解
#include<stdio.h>
#include<math.h>
int main(){
double a,b,c,disc,x1,x2,realpart,imagpart;
while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF){
if(fabs(a)==0) {
x1=-c/b,x2=-c/b;
printf("%lf%lf",x1,x2);
}
else{
disc=b*b-4*c*a;
if(fabs(disc)==0) {
x1=-b/(2*a),x2=-b/(2*a);
printf("%lf%lf",x1,x2);
}
else{
if(disc>0){
x1=(-b+sqrt(disc))/(2*a);
x2=(-b-sqrt(disc))/(2*a);
printf("%lf %lf",x1,x2);
}
else{
realpart=-b/(2*a);
imagpart=sqrt(-disc)/(2*a);
printf("%8.4f+%8.4fi\n",realpart,imagpart);
printf("%8.4f-%8.4fi\n",realpart,imagpart);
}
}
}
}
return 0;
}