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/*-------------------------------- 输入三个点坐标，求三角形面积--------------------------------*/#include<stdio.h>#include<math.h>#include<stdlib.h>void main(){ int x1,y1,x2,y2,x3,y3; //各点坐标 double a,b,c; //边长 double p,*s=NULL; //p是周长的一半，指针s用来开辟空间储存各个三角形的面积 int count=0,i; //count用于计数 scanf("%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3); while(x1 || x2 || x3 || y1 || y2 || y3) { count++; if(count%5==1) s=(double *)realloc(s,(count/5+1)*5*sizeof(double)); a=sqrt( (x1-x2)*(x1-x2) + (y1-y2)*(y1-y2) ); b=sqrt( (x3-x2)*(x3-x2) + (y3-y2)*(y3-y2) ); c=sqrt( (x1-x3)*(x1-x3) + (y1-y3)*(y1-y3) ); p=(a+b+c)/2; *(s+count-1)=sqrt( p*(p-a)*(p-b)*(p-c) ); scanf("%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3); } for(i=0;i<count;i++) printf("%.1f\n",*(s+i)); free(s);} |
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原文地址：http://www.cnblogs.com/gisoracle/p/4890432.html
