View Compilation Error

0_0_35854746_13267.cpp: In function 'void show(int)':
0_0_35854746_13267.cpp:7:2: error: 'a' was not declared in this scope
  a k; 
  ^
0_0_35854746_13267.cpp:13:2: error: 'k' was not declared in this scope
  k.qsort(num,0,m);
  ^