View Compilation Error

0_0_33252116_26849\Main.java:1: 错误: 非法字符: '#'
#include<iostream>
^
0_0_33252116_26849\Main.java:1: 错误: 需要class, interface或enum
#include<iostream>
        ^
0_0_33252116_26849\Main.java:2: 错误: 非法字符: '#'
#include<math.h>
^
0_0_33252116_26849\Main.java:4: 错误: 需要class, interface或enum
int main()
^
0_0_33252116_26849\Main.java:7: 错误: 需要class, interface或enum
	while(cin>>x1>>y1>>x2>>y2){
	^
0_0_33252116_26849\Main.java:9: 错误: 需要class, interface或enum
		num=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
		^
0_0_33252116_26849\Main.java:10: 错误: 需要class, interface或enum
		printf("%.2f\n",num);
		^
0_0_33252116_26849\Main.java:11: 错误: 需要class, interface或enum
	}
	^
0_0_33252116_26849\Main.java:15: 错误: 需要class, interface或enum
}
^
9 个错误