View Compilation Error

221247_0_20014.c: In function `main':
221247_0_20014.c:4: error: `_int64' undeclared (first use in this function)
221247_0_20014.c:4: error: (Each undeclared identifier is reported only once
221247_0_20014.c:4: error: for each function it appears in.)
221247_0_20014.c:4: error: syntax error before "i"
221247_0_20014.c:5: error: `n' undeclared (first use in this function)
221247_0_20014.c:6: error: `i' undeclared (first use in this function)
221247_0_20014.c:11: error: `a' undeclared (first use in this function)
221247_0_20014.c:11: error: `b' undeclared (first use in this function)