View Compilation Error

0_0_1590495_24685.c: In function `main':
0_0_1590495_24685.c:5: error: `_int64' undeclared (first use in this function)
0_0_1590495_24685.c:5: error: (Each undeclared identifier is reported only once
0_0_1590495_24685.c:5: error: for each function it appears in.)
0_0_1590495_24685.c:5: error: syntax error before "f"
0_0_1590495_24685.c: At top level:
0_0_1590495_24685.c:8: error: syntax error before string constant
0_0_1590495_24685.c:8: error: conflicting types for 'scanf'
0_0_1590495_24685.c:8: note: a parameter list with an ellipsis can't match an empty parameter name list declaration
0_0_1590495_24685.c:8: error: conflicting types for 'scanf'
0_0_1590495_24685.c:8: note: a parameter list with an ellipsis can't match an empty parameter name list declaration