View Compilation Error

0_0_35192293_20588\Main.java:2: 错误: 需要class, interface或enum
int Main() {
^
0_0_35192293_20588\Main.java:5: 错误: 需要class, interface或enum
	while(~scanf("%lf%lf", &n, &m)) {
	^
0_0_35192293_20588\Main.java:7: 错误: 需要class, interface或enum
		printf("%.2f\n", ans);
		^
0_0_35192293_20588\Main.java:9: 错误: 需要class, interface或enum
	}
	^
0_0_35192293_20588\Main.java:13: 错误: 需要class, interface或enum
}
^
5 个错误