#include "math.h"  /  *為使用正弦、余弦函數做準備*/
#define  PI  3.1415926  
main()
{float x1,y1,x2,y2,len,angle;
 printf("input the start point:\n");   /*輸入起點、線長、角度*/
 scanf("%f%f",&x1,&y1); printf("input the length:\n");
 scanf("%f",&len);
 printf("input the angle:\n");
 scanf("%f",&angle);
 x2=x1+len*cos(angle*PI/180);   /*求終點坐標*/
 y2=y1+len*sin(angle*PI/180);
 printf("the end position is %6.0f  %6.0f\n",x2,y2);
}