【C】#计算一元二次方程#

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

int main() {
    float a, b, c;
    while(scanf("%f %f %f", &a, &b, &c) != EOF) {
        if (a == 0) {
        printf("Not quadratic equation");
    } else {
        float delta = b * b - 4 * a * c;
        if (delta == 0){
            if(b == 0 && c == 0)
                printf("x1=x2=0.00\n");
            else
                printf("x1=x2=%.2f\n", -b / (2 * a));
        }
        else if (delta > 0)
            printf("x1=%.2f;x2=%.2f\n", (-b - sqrt(delta)) / (2 * a), (-b + sqrt(delta)) / (2 * a));
        else
            printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",  -b / (2 * a) , sqrt(-delta ) / (2 * a), -b / (2 * a) , sqrt(-delta ) / (2 * a));
    }
    }
    
    return 0;
}