数值型型变量自动转换为字符型变量
data _null_;
   set test;
   num_2=count(testnum,'2');
   put num_2=;
run;

thanks

思路如下，还需要修改。
data _null_;
testnum = 33.123 ;
count = 0 ;
j = int(testnum) ;
do while (j ne 0);
        i =  mod( j , 10 ) ;
        if i = 3 then  count +1 ;
        j = int ( j / 10 ) ;
end;

j = testnum - int(testnum) ;

do while (j ne 0 ) ;
        i = int ( j * 10 ) ;
        if i = 3 then count + 1;
        j = j*10 - int( j*10) ;
       
end ;
put " count = " count ;

run ;

data _null_;
   set test;
   num_2=count(testnum,'2');
   put num_2=;
run;
谢谢！

A different solution in the following.

data test;
        format a 20. c_a $20.;
        a = 1243143134131343;
        c_a = put(a,20.);
        num_of_3 = length(c_a) - length(compress(c_a,'3'));
run;