View Compilation Error

0_0_3021796_32364.c: In function `main':
0_0_3021796_32364.c:9: error: `ly' undeclared (first use in this function)
0_0_3021796_32364.c:9: error: (Each undeclared identifier is reported only once
0_0_3021796_32364.c:9: error: for each function it appears in.)
0_0_3021796_32364.c:9: error: `dy' undeclared (first use in this function)