View Compilation Error

0_0_29093852_17971.cpp:1:1: error: 'include' does not name a type
 include<iostream>
 ^
0_0_29093852_17971.cpp: In function 'int main()':
0_0_29093852_17971.cpp:21:5: error: 'cin' was not declared in this scope
     cin>>a>>b>>c;
     ^
0_0_29093852_17971.cpp:22:5: error: 'cout' was not declared in this scope
     cout<<ksm(a,b,c)%c;
     ^