View Compilation Error

0_0_22150873_22550\Main.java:1: 错误: 非法字符: '#'
#include <cstdio>
^
0_0_22150873_22550\Main.java:1: 错误: 需要class, interface或enum
#include <cstdio>
         ^
0_0_22150873_22550\Main.java:2: 错误: 非法字符: '#'
#include <algorithm>
^
0_0_22150873_22550\Main.java:3: 错误: 非法字符: '#'
#include <cmath>
^
0_0_22150873_22550\Main.java:6: 错误: 需要class, interface或enum
int main(){
^
0_0_22150873_22550\Main.java:8: 错误: 需要class, interface或enum
while(scanf("%lf%lf%lf%lf", &a, &b, &c, &d)==4){
^
0_0_22150873_22550\Main.java:9: 错误: 需要class, interface或enum
printf("%.2f\n", sqrt((a-c)*(a-c)+(b-d)*(b-d)));}
                                                ^
0_0_22150873_22550\Main.java:11: 错误: 需要class, interface或enum
}
^
8 个错误