View Compilation Error

0_0_9386112_20889.c: In function `main':
0_0_9386112_20889.c:8: error: `a' undeclared (first use in this function)
0_0_9386112_20889.c:8: error: (Each undeclared identifier is reported only once
0_0_9386112_20889.c:8: error: for each function it appears in.)
0_0_9386112_20889.c:9: error: syntax error before '=' token