View Compilation Error

0_0_7650645_9995.c: In function `main':
0_0_7650645_9995.c:18: error: `bool' undeclared (first use in this function)
0_0_7650645_9995.c:18: error: (Each undeclared identifier is reported only once
0_0_7650645_9995.c:18: error: for each function it appears in.)
0_0_7650645_9995.c:18: error: syntax error before "flag"
0_0_7650645_9995.c:22: error: syntax error before '/' token
0_0_7650645_9995.c:27: error: `flag' undeclared (first use in this function)
0_0_7650645_9995.c: At top level:
0_0_7650645_9995.c:44: error: syntax error before '/' token