View Compilation Error

0_0_10089031_28950.c: In function `main':
0_0_10089031_28950.c:18: error: `_int64' undeclared (first use in this function)
0_0_10089031_28950.c:18: error: (Each undeclared identifier is reported only once
0_0_10089031_28950.c:18: error: for each function it appears in.)
0_0_10089031_28950.c:18: error: syntax error before "res"
0_0_10089031_28950.c:23: error: `res' undeclared (first use in this function)