View Compilation Error

0_0_11562683_16048.c: In function `main':
0_0_11562683_16048.c:13: error: `bool' undeclared (first use in this function)
0_0_11562683_16048.c:13: error: (Each undeclared identifier is reported only once
0_0_11562683_16048.c:13: error: for each function it appears in.)
0_0_11562683_16048.c:13: error: syntax error before "flag"
0_0_11562683_16048.c:14: error: 'for' loop initial declaration used outside C99 mode
0_0_11562683_16048.c:18: error: `flag' undeclared (first use in this function)
0_0_11562683_16048.c:18: error: `false' undeclared (first use in this function)