View Compilation Error

258772_0_20537.c: In function `main':
258772_0_20537.c:4: error: `i' undeclared (first use in this function)
258772_0_20537.c:4: error: (Each undeclared identifier is reported only once
258772_0_20537.c:4: error: for each function it appears in.)
258772_0_20537.c:4: error: `j' undeclared (first use in this function)
258772_0_20537.c:4: error: syntax error before '!' token