Constructing DO Loops
Overview
DO
loops process a group of statements repeatedly rather than once.
This can greatly reduce the number of statements required for a
repetitive calculation. For example, these twelve sum statements
compute a company's annual earnings from investments. Notice that
all 12 statements are identical.
data finance.earnings; set finance.master; Earned=0; earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); earned+(amount+earned)*(rate/12); ...
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