使用平面三点定位算法求解未知点坐标

#include "stdio.h" 
#include "stdlib.h" 
#include <math.h> 
//坐标 
double ax,ay,bx,by,cx,cy,zx,zy; 
//距离 
double la,lb,lc; 
double cx1,cy1,cx2,cy2,cx3,cy3,cx4,cy4; 
int main(void) 
{ 
    int i = 0,j = 0,n = 0; 
    int okflag = 0; 
    int err = 0; 
    int aberr = 0; 
    int acerr = 0; 
    int abcerr = 0; 
    int len; 
    int abrequery = 0; 
    int acrequery = 0; 
    int requery1 = 0; 
    int loopnum = 1; 
    int option = 0; 
    double cax,cay,cbx,cby,ccx,ccy; 
    double cax_abeyance1[6000],cay_abeyance1[6000]; 
    double cbx_abeyance1[6000],cby_abeyance1[6000]; 
    double ccx_abeyance1[6000],ccy_abeyance1[6000]; 
    double cabx_abeyance1[10],caby_abeyance1[10],cabx_abeyance2[10],caby_abeyance2[10]; 
    double cacx_abeyance1[10],cacy_abeyance1[10],cacx_abeyance2[10],cacy_abeyance2[10]; 
    //遍历圆周上所有点 
    printf("use 'Enter' to divide x y\n"); 

    printf("input A coordinate:\n"); 
    scanf("%lf%lf",&ax,&ay); 
    if((ax > 1000)||(bx > 1000)) 
    { 
            printf("figure is too big! input A coordinate again:\n"); 
            scanf("%lf%lf",&ax,&ay); 
    } 
    printf("input B coordinate:\n"); 
    scanf("%lf%lf",&bx,&by); 
    if((bx > 1000)||(bx > 1000)) 
    { 
            printf("figure is too big! input B coordinate again:\n"); 
            scanf("%lf,%lf",&bx,&by);   
    } 
    printf("input C coordinate:\n"); 
    scanf("%lf%lf",&cx,&cy); 
    if((cx > 1000)||(cx > 1000)) 
    { 
            printf("figure is too big! input C coordinate again:\n"); 
            scanf("%lf%lf",&cx,&cy); 
    } 
    printf("input distance from A to Z:\n"); 
    scanf("%lf",&la); 
    if(la > 1000) 
    { 
            printf("figure is too big! inputdistance from A to Z again:\n"); 
            scanf("%lf",&la); 
    } 
    printf("input distance from B to Z:\n"); 
    scanf("%lf",&lb);