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#include 
   
    #include 
    
     double dist(double x1, double y1, double x2, double y2){
   	return sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));}int main(void){
   	double x1, y1;	double x2, y2;		puts("求两点间的距离。 \n");	puts("点A: ");	printf("X坐标:");	scanf("%lf", &x1);	printf("Y坐标:");	scanf("%lf", &y1);	printf("A (%lf, %lf)\n", x1, y1);			puts("点B: ");	printf("X坐标:");	scanf("%lf", &x2); 	printf("Y坐标:");	scanf("%lf", &y2); 	printf("B(%lf, %lf)\n", x2, y2);		printf("两点之间的距离d = %f\n", dist(x1, y1, x2, y2));		return 0;}
    
   

运行结果：

使用结构体计算两点的距离

#include 
   
    #include 
    
     #define sqr(n) ((n) * (n))typedef struct{
   	double x;	double y;} Point;double distance_of(Point pa, Point pb){
   	return sqrt(sqr(pa.x - pb.x) + sqr(pa.y - pb.y));}int main(void){
   	Point crnt, dest;		printf("当前地点的X坐标：");	scanf("%lf", &crnt.x); 		printf("当前地点的Y坐标：");	scanf("%lf", &crnt.y); 		printf("目的地点的Y坐标：");	scanf("%lf", &dest.x); 		printf("目的地点的Y坐标：");	scanf("%lf", &dest.y); 		printf("到目的地的距离为 %.2f。\n", distance_of(crnt, dest));		return 0; }
    
   

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