View Compilation Error

0_0_2761598_10366.c:5: error: syntax error before "flag"
0_0_2761598_10366.c: In function `main':
0_0_2761598_10366.c:11: error: `true' undeclared (first use in this function)
0_0_2761598_10366.c:11: error: (Each undeclared identifier is reported only once
0_0_2761598_10366.c:11: error: for each function it appears in.)
0_0_2761598_10366.c:19: error: `false' undeclared (first use in this function)