View Compilation Error

173533_0_32683.c: In function `main':
173533_0_32683.c:5: error: `_int64' undeclared (first use in this function)
173533_0_32683.c:5: error: (Each undeclared identifier is reported only once
173533_0_32683.c:5: error: for each function it appears in.)
173533_0_32683.c:5: error: syntax error before "i"
173533_0_32683.c:6: error: `a' undeclared (first use in this function)
173533_0_32683.c:8: error: `i' undeclared (first use in this function)
173533_0_32683.c:11: error: `n' undeclared (first use in this function)