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void ABCD (){     int A;     int B;     int C;     int D;          for (A = 1; A <= 9; A++)         {         for (B = 1; B <= 9; B++)             {             for (C = 1; C <= 9; C++)                 {                 for (D = 1; D <= 9; D++)                    {                    if ( pow(A,B) * pow(C,D) == (A*1000 + B*100 + C*10 + D))                    //if ((A^B)*(C^D) == ((A*1000)+(B*100)+(C*10)+D))                       {                             cout << A << "^" << B << "*" << C << "^" << D << "=";                             cout << A << B << C << D << endl;                       }                     }                 }             }           }             }