count trailing spaces

[BrahmanandaRao]

data work.ds;
	length string $20;
 
	string = '12345';
	count_spaces = countc(string,,'st') /*space count*/;
	output;
 
	string = 'A B';
	count_spaces = countc(string,,'st') /*count space between two char*/;
	output;
 
	string = '1 2 3';
	count_spaces = countc(string,,'st') ;/*count spaces between characters*/;
	output;
 
	string = ' a';
	count_spaces = countc(string,,'st')   /*count leading spaces*/;
	output;
	string='a   ';
	count_spaces=countc(string,right,'') /* count trailing spaces */;
run;

How to count trailing spaces 

[ChrisNZ]

Unsure what you're trying to achieve, but this works:

COUNT_TRAILING_SPACES=vlength(STRING)-lengthn(STRING);