View Compilation Error

0_0_25251249_23088.cpp: In function 'int main()':
0_0_25251249_23088.cpp:26:39: error: 'c' was not declared in this scope
         scanf("%d%I64d%d%d",&x,&m,&k,&c);
                                       ^
0_0_25251249_23088.cpp:29:30: error: too many arguments to function 'long long int quick_pow(long long int, int)'
         s=(quick_pow(10,m,mod)-1)%mod/9;
                              ^
0_0_25251249_23088.cpp:6:11: note: declared here
 long long quick_pow(long long a,int n)
           ^