View Compilation Error

0_0_1215084_1513.c: In function `main':
0_0_1215084_1513.c:6: error: `_int64' undeclared (first use in this function)
0_0_1215084_1513.c:6: error: (Each undeclared identifier is reported only once
0_0_1215084_1513.c:6: error: for each function it appears in.)
0_0_1215084_1513.c:6: error: syntax error before "j"
0_0_1215084_1513.c:9: error: `j' undeclared (first use in this function)