标题: TWO QUESTIONS ABOUT DO UNTIL STATEMENT [打印本页] 作者: shiyiming 时间: 2006-4-27 15:36 标题: TWO QUESTIONS ABOUT DO UNTIL STATEMENT PROGRAM1:
data work.test;
x=10;
do until(x>12);
a+1;output;
end;
run;
proc print;run;
Why SAS system always displays 'data step running' after submited the program1?
PROGRAM2:
data work.test;
x=11.5;
do until(x>12);
x+1;output;
end;
run;
proc print;run;
OUTPUT2:
Obs x
1 12.5
Suppose the DO UNTIL steps below:
step1:x=11.5,x>12 is false, then x+1=12.5;
step2:x=12.5,x>12 is ture, then end DO UNTIL statement,executes next statement.
PROGRAM3:
data work.test;
x=12.5;
do until(x>12);
x+1;output;
end;
run;
proc print;run;
OUTPUT3:
Obs x
1 13.5
What is the DO UNTIL steps of program2？作者: shiyiming 时间: 2006-4-27 16:17 标题: 莫非是…… I think that at the beginning of Do Until statement, the default value of the expression(x>12) is false always.
kaka......作者: shiyiming 时间: 2006-4-27 16:28 标题: hoho abc...........................xyz作者: shiyiming 时间: 2006-4-27 21:27 标题: 最终在DO WHILE中找到了答案 问题得到解决。