View Compilation Error

0_0_22838575_12617.cpp: In function 'void quicksort(int, int, char*)':
0_0_22838575_12617.cpp:25:14: error: expected '(' before '%' token
         while%2
              ^
0_0_22838575_12617.cpp:25:14: error: expected primary-expression before '%' token
0_0_22838575_12617.cpp:25:15: error: expected ')' at end of input
         while%2
               ^
0_0_22838575_12617.cpp:25:15: error: expected statement at end of input
0_0_22838575_12617.cpp:25:15: error: expected '}' at end of input
0_0_22838575_12617.cpp:25:15: error: expected '}' at end of input