View Compilation Error

1029795_0_0_23802.cpp: In function `int main()':
1029795_0_0_23802.cpp:5: error: conflicting declaration 'int a[10000]'
1029795_0_0_23802.cpp:5: error: 'a' has a previous declaration as `int a'
1029795_0_0_23802.cpp:5: error: declaration of `int a[10000]'
1029795_0_0_23802.cpp:5: error: conflicts with previous declaration `int a'
1029795_0_0_23802.cpp:7: error: `n' undeclared (first use this function)
1029795_0_0_23802.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
1029795_0_0_23802.cpp:9: error: expected `;' before "sum"
1029795_0_0_23802.cpp:12: error: invalid types `int[int]' for array subscript
1029795_0_0_23802.cpp:14: error: invalid types `int[int]' for array subscript