C语言输出了 -1.#IND00.-1.#IND00 # includevoid main() { \x09double x1,x2,x3,x4,y1,y2,y3,y4,a,b,k1,k2,c,d,e,f;printf("input 4 datas");scanf("%lf %lf %lf% lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);a=(x1+x2)/2;b=(y1+y2)/2;k1=-1*(x2-x1)/(y

C语言输出了 -1.#IND00.-1.#IND00 # includevoid main() { \x09double x1,x2,x3,x4,y1,y2,y3,y4,a,b,k1,k2,c,d,e,f;printf("input 4 datas");scanf("%lf %lf %lf% lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);a=(x1+x2)/2;b=(y1+y2)/2;k1=-1*(x2-x1)/(y
C语言输出了 -1.#IND00.-1.#IND00
# include
void main()
{
\x09double x1,x2,x3,x4,y1,y2,y3,y4,a,b,k1,k2,c,d,e,f;
printf("input 4 datas");
scanf("%lf %lf %lf% lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
a=(x1+x2)/2;
b=(y1+y2)/2;
k1=-1*(x2-x1)/(y2-y1);
c=(x3+x4)/2;
d=(y3+y4)/2;
k2=-1*(x4-x3)/(y4-y3);
e=(d-b+k1*a-k2*c)/(k1-k2);
f=(k1*k2*(c-a)+k2*b-k1*d)/(k2-k1);
printf("%d,%d\n",e,f);
;} 这是原程序

C语言输出了 -1.#IND00.-1.#IND00 # includevoid main() { \x09double x1,x2,x3,x4,y1,y2,y3,y4,a,b,k1,k2,c,d,e,f;printf("input 4 datas");scanf("%lf %lf %lf% lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);a=(x1+x2)/2;b=(y1+y2)/2;k1=-1*(x2-x1)/(y
凡是出现-1.#IND00.基本可以肯定是发生了除0错误.
比如k1=-1*(x2-x1)/(y2-y1);
k2=-1*(x4-x3)/(y4-y3);
e=(d-b+k1*a-k2*c)/(k1-k2);
f=(k1*k2*(c-a)+k2*b-k1*d)/(k2-k1);
都可能发生.