View Compilation Error

0_0_20769326_18689.cpp:1:1: error: 'include' does not name a type
 include<iostream>
 ^
0_0_20769326_18689.cpp: In function 'int main()':
0_0_20769326_18689.cpp:10:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_20769326_18689.cpp:14:2: error: 'cout' was not declared in this scope
  cout<<"Case"<<" "<<i<<":"<<endl;
  ^
0_0_20769326_18689.cpp:14:29: error: 'endl' was not declared in this scope
  cout<<"Case"<<" "<<i<<":"<<endl;
                             ^
0_0_20769326_18689.cpp: In function 'void add(char*, char*)':
0_0_20769326_18689.cpp:27:16: error: 'strlen' was not declared in this scope
  len1=strlen(s1);len2=strlen(s2);
                ^
0_0_20769326_18689.cpp:43:2: error: 'cout' was not declared in this scope
  cout<<a[i];
  ^