View Compilation Error

0_0_7310521_29852.c: In function `main':
0_0_7310521_29852.c:8: error: `bool' undeclared (first use in this function)
0_0_7310521_29852.c:8: error: (Each undeclared identifier is reported only once
0_0_7310521_29852.c:8: error: for each function it appears in.)
0_0_7310521_29852.c:8: error: syntax error before "flag"
0_0_7310521_29852.c:9: error: 'for' loop initial declaration used outside C99 mode
0_0_7310521_29852.c:12: error: `flag' undeclared (first use in this function)