For-statements in C and Java have the form:
for $( expr_l ; expr_2 ; expr_3 ) stmt$
The first expression is executed before the loop; it is typically used for initializing the loop index. The second expression is a test made before each iteration of the loop; the loop is exited if the expression becomes $0$. The loop itself can be thought of as the statement $ \{strmt \ expr_3 ;\}$. The third expression is executed at the end of each iteration; it is typically used to increment the loop index. The meaning of the for-statement is similar to $ expr_1 ; while ( expr2 ) \ \{stmt \ expr_3 ; \}$
Define a class For for for-statements, similar to class If in Fig. $2.43$
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