View Compilation Error

0_0_6971679_18558.cpp: In function `int main()':
0_0_6971679_18558.cpp:4: error: `n' undeclared (first use this function)
0_0_6971679_18558.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6971679_18558.cpp:4: error: expected `,' or `;' before '=' token
0_0_6971679_18558.cpp:9: error: `SUM' cannot be used as a function
0_0_6971679_18558.cpp:9: error: `SUM' cannot be used as a function
0_0_6971679_18558.cpp:10: error: `sum' undeclared (first use this function)