Basic For Loop Issue

[Sahil Kapoor]

Assertion : Here goes the basic for loop syntax

for(Initialization Part ; Condition Test ; Iterator part )

Referring to initialization part :- It is writtten in the K&B book that if there are multiple variables in an Initialization part then

1) they must be separated by commas
2) they must be of same type.

Problem :- Second point seems to be partially true

Following are perfectly working

   class Testfor3 {
  
 
  public static void main(String[] args) {
   
 float f;
 double d;
 int x=0; 
  
for(f=3.14f,d=4.24;x==0;x++)
    System.out.println(f+" "+d);
  }
} 

In above f and d are of different types.

 class Testfor {
  
 
  public static void main(String[] args) {
   
  short x;
  byte b;
  int y;
  long l=2;
  
  for(y=3,b=1,l=3,x=0;;);
  }
}   

This is also working.

Could you please elaborate the logic ???
What exactly going on ??

Thanks !!!

[Prasad Kharkar]

They mean to say
you cannot write

for (int i = 0, float f = 4.5f; ; ){

}