View Compilation Error

0_0_25713443_26052.cpp: In function 'int main()':
0_0_25713443_26052.cpp:10:9: error: 'String' was not declared in this scope
         String str;
         ^
0_0_25713443_26052.cpp:11:14: error: 'str' was not declared in this scope
         cin>>str;
              ^