11 lines
276 B
C++
11 lines
276 B
C++
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//http://acm.hdu.edu.cn/showproblem.php?pid=2001
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#include <cstdio>
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#include <cmath>
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int main(int argc,char ** argv){
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double x1,y1,x2,y2;
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while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!=EOF){
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printf("%.2f\n",sqrt(pow(x1-x2,2)+pow(y1-y2,2)));
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}
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return 0;
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}
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