13 lines
236 B
C
13 lines
236 B
C
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#include <stdio.h>
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#include <math.h>
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#define TWOQ(x) ((x)*(x))
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int main(void){
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double x1,x2,y1,y2;
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while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2) == 4){
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printf("%.2lf\n",sqrt(TWOQ(x1-x2)+TWOQ(y1-y2)));
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getchar();
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}
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return 0;
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}
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