View Compilation Error

1023053_0_0_1260.c: In function `main':
1023053_0_0_1260.c:4: error: syntax error before '.' token
1023053_0_0_1260.c:7: error: `sum' undeclared (first use in this function)
1023053_0_0_1260.c:7: error: (Each undeclared identifier is reported only once
1023053_0_0_1260.c:7: error: for each function it appears in.)