error no name eo2.cpp 6 :lvalue required in function main

[tuga kariem]

#include<iostream.h>
main()
{
  float a;
  cout<<--a++;
 }

What does it mean by error
no name eo2.cpp 6 :lvalue required in function main

[PreethiGowri]

At line 5 you are trying to do both decrement and increment operation which is resulting to this error.
do something like this

float b=--a;
    cout<<b;
  float c= b++;
  cout<<c;