local variable 'b' used without having been initialized
 local variable 'a' used without having been initialzed
 warning C4700: local variable 'c' used without having been initialized
我的程序一直是输出“无解”
# include <stdio.h>
# include <math.h>
int main(void)
{
    double a,b,c;
    double x1,x2;
    double delta;
   
    printf("请输入三个数值\n");
    delta = b * b - 4 * a * c ;
    printf("a = ");
    scanf("%lf",&a);
    printf("b = ");
    scanf("%lf",&b);
    printf("c = ");
    scanf("%lf",&c);
    do
    {
    if(delta > 0)
    {
        x1 = (-b+sqrt(delta))/(2*a);
        x2 = (-b-sqrt(delta))/(2*a);
        printf("x1= %lf,x2 = %lf\n",x1,x2);

    }
    if(delta == 0)
    {
        x1 = (-b)/(2*a);
        x2 = x1;
        printf("x1 = x2 =%lf\n");


    }
    else if(delta < 0)
    {

        printf("无解\n");

    }
    }while(1);


    return 0;
}

圍觀過了

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

int main(void) {
    double a, b, c;
    double x1, x2;
    double delta;
    printf("请输入三个数值\n");
    printf("a = ");
    scanf("%lf", &a);
    printf("b = ");
    scanf("%lf", &b);
    printf("c = ");
    scanf("%lf", &c);
    delta = b * b - 4 * a * c ;

    if(delta > 0) {
        x1 = (-1 * b + sqrt(delta)) / (2 * a);
        x2 = (-1 * b - sqrt(delta)) / (2 * a);
        printf("x1 = %f, x2 = %f\n", x1, x2);

    } else if(delta == 0) {
        x1 = (-1 * b) / (2 * a);
        printf("x1 = x2 = %f\n", x1);

    } else {
        printf("无实数解\n");
    }

    return 0;
}

围观

楼主过年好

# include <stdio.h>
# include <math.h>
int main(void)
{
    double a,b,c;
    double x1,x2;
    double delta;
    do{
    printf("请输入三个数值\n");
       //delta = b * b - 4 * a * c ;
    printf("a = ");
    scanf("%lf",&a);
    printf("b = ");
    scanf("%lf",&b);
    printf("c = ");
    scanf("%lf",&c);

    delta = b * b - 4 * a * c ;//delta值是建立在a，b，c有值的基础上，不能写在a，b，c无值情况下
    if(delta > 0)
    {
        x1 = (-b+sqrt(delta))/(2*a);
        x2 = (-b-sqrt(delta))/(2*a);
        printf("x1= %lf,x2 = %lf\n",x1,x2);

    }
   else if(delta == 0)
    {
        x1 = (-b)/(2*a);
        x2 = x1;
        printf("x1 = x2 =%lf\n");


    }
    else
    {

        printf("无解\n");

    }}while(1);


    return 0;
}

收到的鲜花

• lbt001 于 2015-02-20 22:14 送鲜花  3朵  

围观，我就看看不说话