View Compilation Error

0_0_2149237_13417.c: In function `Prim':
0_0_2149237_13417.c:21: error: `bool' undeclared (first use in this function)
0_0_2149237_13417.c:21: error: (Each undeclared identifier is reported only once
0_0_2149237_13417.c:21: error: for each function it appears in.)
0_0_2149237_13417.c:21: error: syntax error before "visited"
0_0_2149237_13417.c:23: error: `visited' undeclared (first use in this function)
0_0_2149237_13417.c:29: error: `true' undeclared (first use in this function)
0_0_2149237_13417.c: At top level:
0_0_2149237_13417.c:58: error: syntax error before "a"
0_0_2149237_13417.c: In function `dist':
0_0_2149237_13417.c:61: error: `a' undeclared (first use in this function)
0_0_2149237_13417.c:61: error: `b' undeclared (first use in this function)