Game cho Sky

[C++] code giải phương trình bậc 2

#include “stdio.h”
#include “math.h”
#include “conio.h”
void main()
{
clrscr();
printf(“\n------------------------------------------------------”) ;
printf(“\n chuong trinh giai phuong trinh bac 2 : HuanBuiThanh “) ;
printf(“\n ------------------------------------------------------”) ;
float a,b,c,x1,x2,delta;
printf(“\nNhap a : “);
scanf(“%f”, &a);
printf(“\nNhap b : “);
scanf(“%f”, &b);
printf(“\nNhap c : “);
scanf(“%f”, &c);
printf(“\n ——————————–”);
if (a==0)
{
if(b==0)
{
if(c==0)
printf(“\n pt vo so nghiem \n”);
else
printf(“\n pt vo nghiem \n”);
}
else
printf(“\n pt co nghiem x=%f “,-c/b);
}
else
delta=(b*b-4*a*c);
if (delta>0)
{
printf(“\nNghiem x1 la: %.2f”,-b+sqrt(delta)/2*a);
printf(“\nNghiem x2 la: %.2f\n\n”,-b-sqrt(delta)/2*a);
}
if (delta==0)
printf(“\nPhuong trinh da cho co 1 nghiem kep: %.2f\n\n”,-b/2*a);
if (delta<0)
printf(“\nPhuong trinh da cho vo nghiem\n\n”);
getch();
}