View Compilation Error

0_0_3851057_31277.c:6: error: syntax error before '&' token
0_0_3851057_31277.c: In function `SequenceSum':
0_0_3851057_31277.c:14: error: `start' undeclared (first use in this function)
0_0_3851057_31277.c:14: error: (Each undeclared identifier is reported only once
0_0_3851057_31277.c:14: error: for each function it appears in.)
0_0_3851057_31277.c:14: error: `end' undeclared (first use in this function)
0_0_3851057_31277.c:16: error: `n' undeclared (first use in this function)
0_0_3851057_31277.c:20: error: `a' undeclared (first use in this function)