题解 | 计算一元二次方程

#define _CRT_SECURE_NO_WARNINGS 1
//计算一元二次方程
#include <math.h>
#include <stdio.h>

int main() {
    float a, b, c, deter, x1, x2 = 0;
    while (scanf("%f %f %f", &a, &b, &c) != EOF) {
        if (a != 0) {
            deter = pow(b, 2) - 4 * a * c;
            if (deter == 0) {
                if (b != 0)
                {
                    x1 = -b / (2 * a);
                    printf("x1=x2=%.2f\n", x1);
                }
                else
                {
                    printf("x1=x2=0.00\n");
                }

            }
            else if (deter > 0) {
                x1 = ( - b + sqrt(deter)) / (2 * a);
                x2 = ( - b - sqrt(deter)) / (2 * a);
                printf("x1=%.2f;x2=%.2f\n", x2, x1);
            }
            else {
                x1 = -b / (2 * a);//实部
                x2 = sqrt(-deter) / (2 * a);//虚部
                printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n", x1, x2, x1, x2);
            }
        }
        else {
            printf("Not quadratic equation\n");
        }
    }

    return 0;
}