View Compilation Error

0_0_34891000_10204.cpp:29:6: error: 'lom' was not declared in this scope
 ll C(lom a,lom b) 
      ^
0_0_34891000_10204.cpp:29:12: error: 'lom' was not declared in this scope
 ll C(lom a,lom b) 
            ^
0_0_34891000_10204.cpp:29:17: error: expression list treated as compound expression in initializer [-fpermissive]
 ll C(lom a,lom b) 
                 ^
0_0_34891000_10204.cpp:30:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_34891000_10204.cpp: In function 'int main()':
0_0_34891000_10204.cpp:48:19: error: 'C' cannot be used as a function
    cout<<C(m+k-1,k)<<endl;
                   ^
0_0_34891000_10204.cpp:51:22: error: 'C' cannot be used as a function
    ll ans=C(m+k-1,m-1);
                      ^
0_0_34891000_10204.cpp:55:20: error: 'C' cannot be used as a function
     ans+=flag*C(m,i)*C(m+k-i*n-1,m-1)%mod;
                    ^
0_0_34891000_10204.cpp:55:37: error: 'C' cannot be used as a function
     ans+=flag*C(m,i)*C(m+k-i*n-1,m-1)%mod;
                                     ^