Language: C++

#include<iostream>
int main() {
????????int a;
????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
????????return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:1: error: expected primary-expression before '?' token
    3 | ????????int a;
      | ^
a.cc:3:2: error: expected primary-expression before '?' token
    3 | ????????int a;
      |  ^
a.cc:3:3: error: expected primary-expression before '?' token
    3 | ????????int a;
      |   ^
a.cc:3:4: error: expected primary-expression before '?' token
    3 | ????????int a;
      |    ^
a.cc:3:5: error: expected primary-expression before '?' token
    3 | ????????int a;
      |     ^
a.cc:3:6: error: expected primary-expression before '?' token
    3 | ????????int a;
      |      ^
a.cc:3:7: error: expected primary-expression before '?' token
    3 | ????????int a;
      |       ^
a.cc:3:8: error: expected primary-expression before '?' token
    3 | ????????int a;
      |        ^
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:3:9: error: expected ':' before 'int'
    3 | ????????int a;
      |         ^~~
      |         :
a.cc:3:9: error: expected primary-expression before 'int'
    3 | ????????int a;
      |         ^~~
a.cc:4:1: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      | ^
a.cc:4:2: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |  ^
a.cc:4:3: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |   ^
a.cc:4:4: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |    ^
a.cc:4:5: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |     ^
a.cc:4:6: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |      ^
a.cc:4:7: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |       ^
a.cc:4:8: error: expected primary-expression before '?' token
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |        ^
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:4:9: error: expected ':' before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
      |         :
a.cc:4:9: error: expected primary-expression before 'while'
    4 | ????????while (std::cin>>a)?????? std::cout<<a*a*a<<std::endl;
      |         ^~~~~
a.cc:5:1: error: expected primary-expression before '?' token
    5 | ????????return 0;
      | ^
a.cc:5:2: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |  ^
a.cc:5:3: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |   ^
a.cc:5:4: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |    ^
a.cc:5:5: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |     ^
a.cc:5:6: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |      ^
a.cc:5:7: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |       ^
a.cc:5:8: error: expected primary-expression before '?' token
    5 | ????????return 0;
      |        ^
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~
a.cc:5:9: error: expected ':' before 'return'
    5 | ????????return 0;
      |         ^~~~~~
      |         :
a.cc:5:9: error: expected primary-expression before 'return'
    5 | ????????return 0;
      |         ^~~~~~