View Compilation Error

0_0_5406642_30515.c: In function `comp':
0_0_5406642_30515.c:6: error: `_int64' undeclared (first use in this function)
0_0_5406642_30515.c:6: error: (Each undeclared identifier is reported only once
0_0_5406642_30515.c:6: error: for each function it appears in.)
0_0_5406642_30515.c:6: error: syntax error before ')' token
0_0_5406642_30515.c: In function `main':
0_0_5406642_30515.c:12: error: `_int64' undeclared (first use in this function)
0_0_5406642_30515.c:12: error: syntax error before "num"
0_0_5406642_30515.c:20: error: `num' undeclared (first use in this function)