View Compilation Error

0_0_34931355_6282.cpp: In function 'int main()':
0_0_34931355_6282.cpp:7:17: error: declaration of 'a' as multidimensional array must have bounds for all dimensions except the first
         int a[][];int i,j=0,p=0,q=0;
                 ^
0_0_34931355_6282.cpp:10:16: error: 'a' was not declared in this scope
             q+=a[i][j];printf("%.2f\n",(float)q/m)
                ^
0_0_34931355_6282.cpp:11:13: error: expected ';' before 'for'
             for(;j<n;j++)
             ^
0_0_34931355_6282.cpp:11:25: error: expected ';' before ')' token
             for(;j<n;j++)
                         ^