View Compilation Error

0_0_24723888_6849.cpp: In function 'll modpow(ll, ll, ll)':
0_0_24723888_6849.cpp:18:17: error: 'ret' was not declared in this scope
         if(b&1) ret=ret*a%MOD;
                 ^
0_0_24723888_6849.cpp: In function 'll Lucas(ll, ll, ll)':
0_0_24723888_6849.cpp:47:9: error: 'ret' was not declared in this scope
         ret=(ret*fac[a]*modpow(fac[b]*fac[a-b]%p,p-2,p))%p;
         ^
0_0_24723888_6849.cpp:51:12: error: 'ret' was not declared in this scope
     return ret;  
            ^