17 lines
255 B
C++
17 lines
255 B
C++
#include<cstdio>
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#include<cmath>
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using namespace std;
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struct Point
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{
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double x,y;
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};
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int main()
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{
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Point p1,p2;
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scanf("%lf%lf%lf%lf",&p1.x,&p1.y,&p2.x,&p2.y);
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double a=abs(p1.x-p2.x),b=abs(p1.y-p2.y),c=sqrt(a*a+b*b);
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printf("%.3lf\n",c);
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return 0;
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}
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