View Compilation Error

0_0_38624483_29844.cpp:2:13: error: expected ',' or '...' before numeric constant
 #define mod 998244353
             ^~~~~~~~~
0_0_38624483_29844.cpp:12:50: note: in expansion of macro 'mod'
 long long powr(long long a,long long b,long long mod)//a的b次方
                                                  ^~~