error03_1.cpp

浙大颜晖视频课件

#include <stdio.h>
#include <math.h>
int main(void)
{
	double a, b, c,d;

	printf("Enter a, b, c \n");
	scanf("%lf%lf%lf", &a, &b, &c);
	d = b * b - 4 * a * c;
	if(a==0){
		if(b = 0){
			if(c == 0)
				printf("参数都为零，方程无意义!\n");
			else
				printf("a和b为0，c不为0，方程不成立\n");
		}
		else
			printf("x = %0.2f\n", -c/b);
	}
	else
		if(d >= 0){
			printf("x1=%0.2f\n", (-b+sqrt(d))/(2*a));
			printf("x2=%0.2f\n", (-b-sqrt(d))/(2*a));
		}
		else{
			printf("x1=%0.2f+%0.2fi\n", -b/(2*a), sqrt(-d)/(2*a));
			printf("x2=%0.2f-%0.2fi\n", -b/(2*a), sqrt(-d)/(2*a));
		}

   return 0; 
}