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计算两点间的距离

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 440533    Accepted Submission(s): 146214


Problem Description
输入两点坐标（X1,Y1）,（X2,Y2）,计算并输出两点间的距离。
 

Input
输入数据有多组，每组占一行，由4个实数组成，分别表示x1,y1,x2,y2,数据之间用空格隔开。
 

Output
对于每组输入数据，输出一行，结果保留两位小数。
 

Sample Input
0 0 0 1
0 1 1 0
 

Sample Output
1.00
1.41
 

Author
lcy
 

Source
C语言程序设计练习（一）
 

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