Comparison of bool data types in C++

Question

The bool data type is commonly represented as 0 (as false) and 1 (as true). However, some say that true values can be represented by a value other than 1. If the later statement is true, then the following expression may be incorrect.

bool x = 1;
if (x==1)
    Do something..

I am wondering if the following statements would work as desired and expected on commonly used compilers.

1.  

   bool x = 1;
   if (x==1)
       Do something.
   

2.  

   bool y = 0;
   if (y>0.5)
       Do something..
   

3.  

   bool z = 1;
   if(z>0.5)
       Do something...
   

Answer 1

§4.5 of the C++ standard says:

An rvalue of type bool can be converted to an rvalue of type int, with false becoming zero and true becoming one.

regarding 2 and 3, type conversion takes place so the statements will work as desired