View Compilation Error

0_0_4469120_9242.c:3: error: syntax error before '&' token
0_0_4469120_9242.c: In function `scanf_':
0_0_4469120_9242.c:6: error: `bool' undeclared (first use in this function)
0_0_4469120_9242.c:6: error: (Each undeclared identifier is reported only once
0_0_4469120_9242.c:6: error: for each function it appears in.)
0_0_4469120_9242.c:6: error: syntax error before "neg"
0_0_4469120_9242.c:10: error: `neg' undeclared (first use in this function)
0_0_4469120_9242.c:10: error: `true' undeclared (first use in this function)
0_0_4469120_9242.c:13: error: `num' undeclared (first use in this function)