View Compilation Error

0_0_10310211_11502.c: In function `main':
0_0_10310211_11502.c:50: error: `xx' undeclared (first use in this function)
0_0_10310211_11502.c:50: error: (Each undeclared identifier is reported only once
0_0_10310211_11502.c:50: error: for each function it appears in.)
0_0_10310211_11502.c:50: error: `yy' undeclared (first use in this function)
0_0_10310211_11502.c:50: error: `zz' undeclared (first use in this function)