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int main()
{
    // 1
    int& x1[5];
 
    // 2
    int * x2;
 
    // 3
    int *x3, *x4;
    auto dx = x3 - x4;
 
    // 4
    int *x5 = x3*5;
 
    // 5
    auto x6 = x3 + x4;
 
    // 6
    int& z;
 
    // 7
    auto y = &z;
}
 
 

prog.cpp:4:12: error: 'x1' declared as array of references of type 'int &'
    int& x1[5];
           ^
prog.cpp:11:5: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
    auto dx = x3 - x4;
    ^
prog.cpp:14:17: error: invalid operands to binary expression ('int *' and 'int')
    int *x5 = x3*5;
              ~~^~
prog.cpp:17:5: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
    auto x6 = x3 + x4;
    ^
prog.cpp:17:18: error: invalid operands to binary expression ('int *' and 'int *')
    auto x6 = x3 + x4;
              ~~ ^ ~~
prog.cpp:20:10: error: declaration of reference variable 'z' requires an initializer
    int& z;
         ^
prog.cpp:23:5: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
    auto y = &z;
    ^
3 warnings and 4 errors generated.

Standard output is empty