DATA MYCLASS;
	SET SASHELP.CLASS;
	IF WEIGHT<120 THEN NOTE= 'Normal';
	ELSE DO;
	NOTE= 'Heavy';
	/* 赋值成缺失值 */
	WEIGHT=.;
	END;
RUN;

PROC PRINT; RUN;

DATA B;
	DO k = 11 TO 0 BY -3;
	IF k < 5 THEN i = k;
	ELSE i = k - 1;
	OUTPUT;
	END;
RUN;

PROC PRINT; RUN;

DO WHILE:只要条件满足，DO-END 之间语句被重复执行。

DATA D;
	j = 0;
	DO WHILE (j <= 4);
	OUTPUT;
	j = j + 1;
	END;
RUN;

PROC PRINT; RUN;

 

 DO UNTIL:DO-END之间语句被重复执行，直到条件满足停止。

DATA D;
	j = 0;
	DO UNTIL (j > 4);
	OUTPUT;
	j = j + 1;
	END;
RUN;

PROC PRINT; RUN;

DO OVER:

DATA test;
	ARRAY X X1-X5 (1 2 3 4 5);
	DO OVER X;
	X=X*100;
	OUTPUT;
	END;
RUN;

PROC PRINT; RUN;