View Compilation Error

0_0_26863851_16407.cpp: In function 'int main()':
0_0_26863851_16407.cpp:21:10: error: 'T' was not declared in this scope
     cin>>T;while(T--){
          ^
0_0_26863851_16407.cpp:4:13: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'int' to binary 'operator%'
 #define mod 998244353
             ^
0_0_26863851_16407.cpp:23:31: note: in expansion of macro 'mod'
     cout<<(pow(2,a+b)*(c+d+1)%mod+(pow(2,c)-c-1)*pow(2,a)%mod+mod)%mod<<end;
                               ^
0_0_26863851_16407.cpp:4:13: error: invalid operands of types '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}' and 'int' to binary 'operator%'
 #define mod 998244353
             ^
0_0_26863851_16407.cpp:23:59: note: in expansion of macro 'mod'
     cout<<(pow(2,a+b)*(c+d+1)%mod+(pow(2,c)-c-1)*pow(2,a)%mod+mod)%mod<<end;
                                                           ^