运行 ID: 129802

Main.cc: In function ‘int main()’:
Main.cc:9:46: error: lvalue required as left operand of assignment
    (a*1000+b*100+c*10+d)*9=d*1000+c*100+b*10+a
                                              ^
Main.cc:4:5: warning: unused variable ‘a’ [-Wunused-variable]
 int a,b,c,d;
     ^
Main.cc:4:7: warning: unused variable ‘b’ [-Wunused-variable]
 int a,b,c,d;
       ^
Main.cc:4:9: warning: unused variable ‘c’ [-Wunused-variable]
 int a,b,c,d;
         ^
Main.cc:4:11: warning: unused variable ‘d’ [-Wunused-variable]
 int a,b,c,d;
           ^