View Compilation Error

0_0_18132243_1295.cpp: In function 'void updata2(int, int, int, int)':
0_0_18132243_1295.cpp:40:15: error: expected primary-expression before '%' token
     int mid = %
               ^
0_0_18132243_1295.cpp:40:15: error: expected primary-expression at end of input
0_0_18132243_1295.cpp:40:15: error: expected ',' or ';' at end of input
0_0_18132243_1295.cpp:40:15: error: expected '}' at end of input