View Compilation Error

0_0_25858660_3256.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_25858660_3256.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_25858660_3256.cpp:4:11: error: '::main' must return 'int'
 void main()
           ^
0_0_25858660_3256.cpp: In function 'int main()':
0_0_25858660_3256.cpp:6:1: error: 'string' was not declared in this scope
 string a;
 ^
0_0_25858660_3256.cpp:8:7: error: 'cin' was not declared in this scope
 while(cin >> a>> b)
       ^
0_0_25858660_3256.cpp:8:14: error: 'a' was not declared in this scope
 while(cin >> a>> b)
              ^
0_0_25858660_3256.cpp:16:1: error: 'cout' was not declared in this scope
 cout<<sum<<endl;
 ^
0_0_25858660_3256.cpp:16:12: error: 'endl' was not declared in this scope
 cout<<sum<<endl;
            ^