View Compilation Error

0_0_2976116_2043.c: In function `cmp':
0_0_2976116_2043.c:8: error: `city' undeclared (first use in this function)
0_0_2976116_2043.c:8: error: (Each undeclared identifier is reported only once
0_0_2976116_2043.c:8: error: for each function it appears in.)
0_0_2976116_2043.c:8: error: syntax error before ')' token
0_0_2976116_2043.c:8: error: syntax error before ')' token