View Compilation Error

0_0_22170767_7140.cpp: In function 'int main()':
0_0_22170767_7140.cpp:4:1: error: 'cout' was not declared in this scope
 cout << a <<endl;}
 ^
0_0_22170767_7140.cpp:4:13: error: 'endl' was not declared in this scope
 cout << a <<endl;}
             ^