View Compilation Error

0_0_11395215_30495.c:6: error: syntax error before "p0"
0_0_11395215_30495.c: In function `cross':
0_0_11395215_30495.c:8: error: `p1' undeclared (first use in this function)
0_0_11395215_30495.c:8: error: (Each undeclared identifier is reported only once
0_0_11395215_30495.c:8: error: for each function it appears in.)
0_0_11395215_30495.c:8: error: `p0' undeclared (first use in this function)
0_0_11395215_30495.c:8: error: `p2' undeclared (first use in this function)