View Compilation Error

0_0_30548331_20464.cpp: In function 'void Add(int, int)':
0_0_30548331_20464.cpp:14:11: error: 'n' was not declared in this scope
  while(a<=n){
           ^
0_0_30548331_20464.cpp: At global scope:
0_0_30548331_20464.cpp:20:14: error: expression list treated as compound expression in initializer [-fpermissive]
 int Query(a,b){
              ^
0_0_30548331_20464.cpp:20:15: error: expected ',' or ';' before '{' token
 int Query(a,b){
               ^