View Compilation Error

0_0_4243683_24208.c: In function `main':
0_0_4243683_24208.c:11: error: `sum' undeclared (first use in this function)
0_0_4243683_24208.c:11: error: (Each undeclared identifier is reported only once
0_0_4243683_24208.c:11: error: for each function it appears in.)
0_0_4243683_24208.c:17: error: syntax error before "int"