View Compilation Error

0_0_29431322_7415\Main.java:1: 错误: 需要class, interface或enum
using namespace std;
^
0_0_29431322_7415\Main.java:3: 错误: 需要class, interface或enum
int main()
^
0_0_29431322_7415\Main.java:6: 错误: 需要class, interface或enum
    while(~scanf("%d",&t))
    ^
0_0_29431322_7415\Main.java:11: 错误: 需要class, interface或enum
            scanf("%d", &n);
            ^
0_0_29431322_7415\Main.java:12: 错误: 需要class, interface或enum
            double x = n * log10(n*1.0);
            ^
0_0_29431322_7415\Main.java:13: 错误: 需要class, interface或enum
            x -= (__int64)x;
            ^
0_0_29431322_7415\Main.java:14: 错误: 需要class, interface或enum
            int a = pow(10.0, x);
            ^
0_0_29431322_7415\Main.java:15: 错误: 需要class, interface或enum
            printf("%d\n", a);
            ^
0_0_29431322_7415\Main.java:16: 错误: 需要class, interface或enum
        }
        ^
9 个错误