View Compilation Error

162691_0_11153.c: In function `main':
162691_0_11153.c:10: error: `r' undeclared (first use in this function)
162691_0_11153.c:10: error: (Each undeclared identifier is reported only once
162691_0_11153.c:10: error: for each function it appears in.)
162691_0_11153.c:17: error: `k' undeclared (first use in this function)
162691_0_11153.c:18: error: `j' undeclared (first use in this function)