View Compilation Error

0_0_29415445_21484\Main.java:3: 错误: 需要';'
double f(double a);
        ^
0_0_29415445_21484\Main.java:3: 错误: 需要';'
double f(double a);
                 ^
0_0_29415445_21484\Main.java:4: 错误: 需要';'
int main()
        ^
0_0_29415445_21484\Main.java:7: 错误: 非法的表达式开始
    while(scanf("%lf", &a) != EOF)
                       ^
0_0_29415445_21484\Main.java:14: 错误: 需要';'
double f(double a)
        ^
0_0_29415445_21484\Main.java:14: 错误: 需要';'
double f(double a)
                 ^
0_0_29415445_21484\Main.java:21: 错误: 解析时已到达文件结尾
}
 ^
7 个错误