software global project

1

//두개의 원을 입력받아 겹치는지,접하는지,떨어져있는지 판별
#include<stdio.h>
#include<math.h>

typedef struct circle{
	double x,y,r;
}circle;

int circleRel(circle, circle);

void main(int argc, char *argv[])
{
	circle cir1,cir2;
	int res;

	if(argc == 1){
		printf("Type the coordinates(x,y) and radius(r) of first circle : ");
		scanf("%lf %lf %lf",&cir1.x,&cir1.y,&cir1.r);
		printf("%.2f %.2f %.2f\n",cir1.x,cir1.y,cir1.r);	

		printf("Type the coordinates(x,y) and radius(r) of second circle : ");
		scanf("%lf %lf %lf",&cir2.x,&cir2.y,&cir2.r);
		printf("%.2f %.2f %.2f\n",cir2.x,cir2.y,cir2.r);
	}
	else if(argc == 7){
		printf("%s %s %s %s %s %s\n",argv[1],argv[2],argv[3],argv[4],argv[5],argv[6]);
		cir1.x = atof(argv[1]);
		cir1.y = atof(argv[2]);
		cir1.r = atof(argv[3]);
		cir2.x = atof(argv[4]);
		cir2.y = atof(argv[5]);
		cir2.r = atof(argv[6]);
	}
	else{
		printf("Error!\n");
		printf("\t(Usage> file\n");
		printf("\t<Usage> file x1 y1 r1 x2 y2 r2\n");
		return;
	}
	if(cir1.r < 0 || cir2.r <0){
		printf("input radius erroe!!\n");
		return;
	}

	res=circleRel(cir1,cir2);
	switch(res){
	case 0 : printf("Two circle are overlapped\n"); break;
	case 1 : printf("Two circles are met\n"); break;
	case 2 : printf("Two circles are distant\n"); break;
	}	
}
int circleRel(circle c1, circle c2){

	double distance;
	double r1,r2;  //r1>r2

	distance=sqrt((pow(c2.x-c1.x,2)+pow(c2.y-c1.y,2)));	

	if(c1.r>c2.r){
		r1=c1.r;
		r2=c2.r;
	}
	else{
		r1=c2.r;
		r2=c1.r;
	}

	if(distance == r1-r2 || distance == r1+r2)  // 내접 or 외접
		return 1;
	else if(distance > r1+r2 || distance < r1-r2)  //외부 or 내부
		return 2;
	else if(r1-r2 < distance && distance < r1+r2)  //두점이 만날때
		return 0;
}

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