Programmatically solve the equation ax2 + bx + c = 0, the real coefficients a, b, c entered from the keyboard.
#include <math.h>
void main()
{
float a, b, c, d;
clrscr();
printf(“Nhap cac he so a, b, c : “);
scanf(”%f%f%f”, &a, &b, &c);
if (a)
{
d = b *b - 4 *a * c;
if (d < 0) printf(“Vo nghiem !”);
if (d == 0) printf(“Nghiem kep x=%4.2f”, -0.5 *b / a);
if (d > 0)
{
printf(“Hai nghiem phan biet :\n”);
printf(“x1=%4.2f”, 0.5 *(-b - sqrt(d)) / a);
printf(" x2=%4.2f", 0.5 *(-b + sqrt(d)) / a);
}
}
else if (b) printf(“Mot nghiem x=%4.2f”, -c / b);
else if (c) printf(“Vo nghiem !”);
else printf(“Vo so nghiem !”);
getch();
}