View Compilation Error

0_0_4418956_7457.c: In function `scanf_':
0_0_4418956_7457.c:6: error: `bool' undeclared (first use in this function)
0_0_4418956_7457.c:6: error: (Each undeclared identifier is reported only once
0_0_4418956_7457.c:6: error: for each function it appears in.)
0_0_4418956_7457.c:6: error: syntax error before "neg"
0_0_4418956_7457.c:10: error: `neg' undeclared (first use in this function)
0_0_4418956_7457.c:10: error: `true' undeclared (first use in this function)