题解 | #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) {
        float deta = b * b - 4 * a * c;
        if (a == 0) {
            printf("Not quadratic equation\n");
        } else {
            if (deta == 0) {
                if (b == 0) {
                    printf("x1=x2=%.2f\n", 0);
                } else {
                    printf("x1=x2=%.2f\n", (-b) / (2 * a));
                }
            } else if (deta > 0) {
                printf("x1=%.2f;x2=%.2f\n", ((-b) - sqrt(deta)) / (2 * a),
                       ((-b) + sqrt(deta)) / (2 * a));
            } else {
                printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n", (-b) / (2 * a), sqrt(-deta) / (2 * a),
                       (-b) / (2 * a), sqrt(-deta) / (2 * a));
            }
        }
    }
    return 0;
}