View Compilation Error

0_0_6275191_13667.c: In function `main':
0_0_6275191_13667.c:23: error: `Monster' undeclared (first use in this function)
0_0_6275191_13667.c:23: error: (Each undeclared identifier is reported only once
0_0_6275191_13667.c:23: error: for each function it appears in.)
0_0_6275191_13667.c:23: error: syntax error before "mon"
0_0_6275191_13667.c:32: error: `mon' undeclared (first use in this function)