#define _CRT_SECURE_NO_WARNINGS

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

void main()
{
    int a, b, c;
    scanf("%d%d%d", &a, &b, &c);
    printf("%d*x*x+%d*x+%d=0", a, b, c);

    if (a == 0)
    {
        if (b == 0)
        {
            if (c == 0)
            {
                printf("x为任意值");
            }
            else
            {
                printf("x无解");
            }
        }
        else
        {
            printf("一元一次方程的值是x=%f", -1.0*c / b);
        }
    }
    else
    {
        int N = b*b - 4 * a*c;
        double X = -1.0*b / 2 / a;

        if (N == 0)
        {
            printf("一元二次方程的解为x1=x2=%f", X);
        }
        else if (N > 0)
        {
            double Y = sqrt(N) / 2.0 / a;
            printf("一元二次方程的解为x1=%f,x2=%f", X + Y, X - Y);
        }
        else
        {
            double Z = sprt(-1 * N) / 2.0 / a;
            printf("一元二次方程的解为x1=%f+%fi,x2=%f-%fi", X, Z, X, Z);
        }
    }


    system("pause");
}



出错的提示：

谢谢啊，真是粗心，而且我检查了好久都没有发现。