View Compilation Error

211257_0_7278.c: In function `main':
211257_0_7278.c:4: error: `m' undeclared (first use in this function)
211257_0_7278.c:4: error: (Each undeclared identifier is reported only once
211257_0_7278.c:4: error: for each function it appears in.)
211257_0_7278.c:4: error: `n' undeclared (first use in this function)
211257_0_7278.c:4: error: break statement not within loop or switch