View Compilation Error

0_0_10421411_29182.c: In function `cmp':
0_0_10421411_29182.c:12: error: `gr' undeclared (first use in this function)
0_0_10421411_29182.c:12: error: (Each undeclared identifier is reported only once
0_0_10421411_29182.c:12: error: for each function it appears in.)
0_0_10421411_29182.c:12: error: `c' undeclared (first use in this function)
0_0_10421411_29182.c:12: error: syntax error before ')' token
0_0_10421411_29182.c:13: error: `d' undeclared (first use in this function)
0_0_10421411_29182.c:13: error: syntax error before ')' token
0_0_10421411_29182.c: In function `main':
0_0_10421411_29182.c:34: error: `gr' undeclared (first use in this function)
0_0_10421411_29182.c:34: error: syntax error before "graph"
0_0_10421411_29182.c:42: error: `graph' undeclared (first use in this function)