판별식을 이용한 이차 방정식의 근의 종류 판별하기

#include <stdio.h>

int a, b, c, d;

void main()
{

scanf("%d %d %d", &a, &b, &c);
d = b * b - 4 * a * c;
if (d > 0)

printf("The equation %d x^2 + %d x + %d has the real roots.\n", a, b, c);

else if (d < 0)

printf("The equation %d x^2 + %d x + %d has the imaginary roots.\n", a, b, c);

else

printf("The equation %d x^2 + %d x + %d has the multiple root.\n", a, b, c);

}