View Compilation Error

0_0_5350825_30842.cpp: In function `int main()':
0_0_5350825_30842.cpp:5: error: expected unqualified-id before "long"
0_0_5350825_30842.cpp:5: error: expected `,' or `;' before "long"
0_0_5350825_30842.cpp:9: error: `sum' undeclared (first use this function)
0_0_5350825_30842.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)