View Compilation Error

0_0_4942787_22112.cpp: In function `void add(char*, char*, char*)':
0_0_4942787_22112.cpp:50: error: invalid conversion from `int' to `char*'
0_0_4942787_22112.cpp:54: error: invalid conversion from `char*' to `char'
0_0_4942787_22112.cpp:55: error: invalid conversion from `char' to `char*'