View Compilation Error

0_0_8559694_25152.c: In function `main':
0_0_8559694_25152.c:5: error: `__int64_t' undeclared (first use in this function)
0_0_8559694_25152.c:5: error: (Each undeclared identifier is reported only once
0_0_8559694_25152.c:5: error: for each function it appears in.)
0_0_8559694_25152.c:5: error: syntax error before "i"
0_0_8559694_25152.c: At top level:
0_0_8559694_25152.c:7: error: invalid initializer
0_0_8559694_25152.c:8: error: conflicting types for 'a'
0_0_8559694_25152.c:7: error: previous definition of 'a' was here
0_0_8559694_25152.c:8: error: invalid initializer
0_0_8559694_25152.c:9: error: syntax error before "for"