#include <stdio.h>
#include <math.h>
int main()
{
float x1,y1,x2,y2;
while(scanf("%f %f %f %f",&x1,&y1,&x2,&y2)!=EOF)
{
printf("%.2f\n",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
}
return 0;
#include <math.h>
int main()
{
float x1,y1,x2,y2;
while(scanf("%f %f %f %f",&x1,&y1,&x2,&y2)!=EOF)
{
printf("%.2f\n",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
}
return 0;
}
注意：类型的转换
若写成 int a=((x1-x2)*(x1-x2);
int b=(y1-y2)*(y1-y2);
错误