View Compilation Error

0_0_19304368_27681\Main.java:1: 错误: 非法字符: '#'
#include<stdio.h>
^
0_0_19304368_27681\Main.java:1: 错误: 需要class, interface或enum
#include<stdio.h>
        ^
0_0_19304368_27681\Main.java:2: 错误: 非法字符: '#'
#include<math.h>
^
0_0_19304368_27681\Main.java:6: 错误: 需要class, interface或enum
	double l;
	^
0_0_19304368_27681\Main.java:7: 错误: 需要class, interface或enum
	while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2)!=EOF)
	^
0_0_19304368_27681\Main.java:10: 错误: 需要class, interface或enum
		printf("%0.2lf\n",l);
		^
0_0_19304368_27681\Main.java:11: 错误: 需要class, interface或enum
	}
	^
0_0_19304368_27681\Main.java:13: 错误: 需要class, interface或enum
}
^
8 个错误