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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: In function 'int main()':
prog.cpp:4:14: error: declaration of 'x1' as array of references
     int& x1[5];
              ^
prog.cpp:14:18: error: invalid operands of types 'int*' and 'int' to binary 'operator*'
     int *x5 = x3*5;
                  ^
prog.cpp:17:20: error: invalid operands of types 'int*' and 'int*' to binary 'operator+'
     auto x6 = x3 + x4;
                    ^
prog.cpp:20:10: error: 'z' declared as reference but not initialized
     int& z;
          ^

Standard output is empty