Convert for loop to while loop

[Hela]

Hi, could someone help me convert this for loop to while loop
And how to detect how many times each one is executed or evaluated please?
Thank you

int x=1, a=33;
for(a=17; a< 20; a++){
	x++;
}

******************************

int x=1, a=33;

while(          ){

	x++;

}

Final value of a:______ 
Final value of x:______ 
How many times a=17 is executed :______
How many times a< 20 is evaluated:_______
How many times x++   is executed:________
How many times a++ is executed:_________