View Compilation Error

0_0_7129425_20037.c: In function `main':
0_0_7129425_20037.c:4: error: `_int64' undeclared (first use in this function)
0_0_7129425_20037.c:4: error: (Each undeclared identifier is reported only once
0_0_7129425_20037.c:4: error: for each function it appears in.)
0_0_7129425_20037.c:4: error: syntax error before "m"
0_0_7129425_20037.c:5: error: `n' undeclared (first use in this function)
0_0_7129425_20037.c:5: error: `m' undeclared (first use in this function)