请教各位—如何将数据集的数值变量变为字符变量

shiyiming

已建立数据集：
data a;
input x;
cards;
1
2
3
;
run;

如何将上数值变量中的值转换字符型?

shiyiming

[code:2baam81q]data a;
     input x;
         format xx $3.;
         xx=x;
     cards;
1
2
3
;
run;[/code:2baam81q]

shiyiming

[code:2e0ob7o1]data c;
set a;
b=put(x,1.);
run;[/code:2e0ob7o1]

shiyiming

Thanks a lot!!!