Dale - Computer Science Illuminated 285

Dale - Computer Science Illuminated 285 - 258 Chapter 8...

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Unformatted text preview: 258 Chapter 8 High-Level Programming Languages read in a name, an age, and an hourly wage. The three items could be bound together into a record. Let’s look at how a record type is declared in our three languages. Language Ada Record Type Declaration X‘S" )e "7JX= 9 o JX= 9 ?"hh"YBi X‘S" * SlD‘""7F‘S" o ="PD= )e " , )e "7JX= 9 i . " , I9X" "= =e9 " Yhh"YYi 5D\=l‘7we " , lDeX =e9 " "hYhh:YYYhYi "9 ="PD= i JX=\PX\=" * SlD‘"" W )e " .o JX= 9 W . " .o I9X" "= W 5D\=l‘we " .o J 9 l" *9 JX=\PX\=" oX=\PX * SlD‘""F‘S" C oX= 9 9e "i 9X e "i —lDeX zD\=l‘we "i Di VB.NET C++ Although the syntax is quite different, three elements are present: A record type is defined with a name and three variable names are defined with their data types. Notice that Ada allows the programmer to declare a range of a numeric data types. The . " field is defined as a reasonable subrange of the integers. If the program tries to store a value outside that range into . ", an error occurs. 5D\=l‘7we " is defined as a reasonable subrange of the reals. This is a very nice safety feature in the language. How do you access the fields within a record? Well, first you have to declare a record to be of the record type, and then you can access the fields within the record variable. The syntax for declaring a record variable and the accessing mechanism for the variables is shown on the next page. ...
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