View Compilation Error

0_0_2341417_27804.cpp: In function `void add(char*, char*, char*)':
0_0_2341417_27804.cpp:20: error: expected primary-expression before '%' token
0_0_2341417_27804.cpp:20: error: expected `;' at end of input
0_0_2341417_27804.cpp:20: error: expected `}' at end of input
0_0_2341417_27804.cpp:20: error: expected `}' at end of input