By Andrew Koenig, Barbara E. Moo
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Extra info for Accelerated C++: Practical Programming by Example
Finally, it writes the output, a line at a time. The #include directives and the first three statements in this program should be familiar. The definition of greeting, on the other hand, introduces three new ideas. One idea is that we can give a variable a value as we define it. We do so by placing, between the variable's name and the semicolon that follows it, an = symbol followed by the value that we wish the variable to have. 2/176 shows that strings and string literals do-the implementation will convert the initial value to the type of the variable.
Note particularly the presence and absence of semicolons. We do not write a semicolon after the init-statement or statement because they are statements, with their own semicolons if they need them. We do include a semicolon after expression in order to turn it into a statement. 4/23 into three cases: We are writing a single asterisk, a space, or the entire greeting. As our program stands, we adjust c to maintain our invariant after we write an asterisk, and we adjust it again after we write a space.
Doing so makes the invariant true at the end of the body, so we have met the second requirement. Because both requirements are true, we know that after the while finishes, we have written r rows. Moreover, we have already seen that r == rows. Together, these two facts imply that rows is the total number of rows that we have written. The strategy that we used to understand this loop will come in handy in a variety of contexts. The general idea is to find an invariant that states a relevant property of the variables that the loop involves (we have written r rows), and to use the condition to ensure that when the loop completes, those variables will have useful values (r == rows).