View Compilation Error

0_0_6642032_10747.c: In function `main':
0_0_6642032_10747.c:5: error: `int64_t' undeclared (first use in this function)
0_0_6642032_10747.c:5: error: (Each undeclared identifier is reported only once
0_0_6642032_10747.c:5: error: for each function it appears in.)
0_0_6642032_10747.c:5: error: syntax error before "a"
0_0_6642032_10747.c:7: error: `a' undeclared (first use in this function)