#include<stdio.h>
#include<math.h>
int main(){

	int a,b,c,y;

	do{
		printf("solving quadratic equation: ax^2+bx+c=0\n");
		
		do{
			printf("a= ");
			scanf("%d",&a);
			if(a<=0)
				printf("a cant be equal to 0\n");
		}while(a==0);

		printf("b= ");
		scanf("%d",&b);

		printf("c= ");
		scanf("%d",&c);

			if(b*b+4*a*c<0)
				printf("no real root\n");
			else if(b*b+4*a*c==0)
			{
				printf("there is an equal root\n");
				printf("it is %d\n",(-b/2*a));
			}
			else
			{
				printf("there are two root\n");
				printf("there are %d and %d\n",(-b+(b*b+4*a*c))/2*a,(-b-(b*b+4*a*c)/2*a));
			}
		printf("continue(yes=1/no=0)? ");
		scanf("%d",&y);
	}while(y==1);
	
	return 0;
}