#include <stdio.h>
#include <math.h>

int main()
{
	float a, b, c, d, root1, root2;
	int more=1;	
	while (1){
 printf("Solving quadratic equation: ax^2+bx+c=0\n");
	 do
     {
		printf("a= ");

		 scanf("%f", &a);
		if(a==0)
		 printf("a can't be equal to 0\n");
	
	} while (a==0);
	do{
		printf("b=");
		scanf("%f", &b);
		printf("c=");
		scanf("%f", &c);}
	d = b * b - 4 * a * c;

        if (d < 0)
            printf("No real root\n\n");
        else if ( d == 0)
       {
            root1 = -b / (2 * a) ;
            printf("There is an equal roots.\n");
            printf("It is %f.", root1);
       }
       else
       {
            root1 = (-b + sqrt(d)) / (2 * a);
            root2 = (-b - sqrt(d)) / (2 * a);
            printf("There are two real roots.\n");
            printf("They are %.2f and %.2f\n\n",root1, root2);
       }
	 do{
                printf("Continue (yes=1/no=0)? ");
                scanf("%d", &more);}
        while (more !=1 && more !=0);

        printf("\n");
       } while (more==1);
}
	return 0;
}