Starting Out with C++ from Control Structures to Objects (9th Edition)
9th Edition
ISBN: 9780134498379
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 22RQE
T F A variable must be defined before it can be used.
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A(n) ____ variable is defined inside a function and is not accessible outsidethe function .
T F A variable must be defined before it can be used.
Usernames
An online company needs your help to implement a program that verifies the username chosen by a new user. Their rules is described below:
Username MUST contain at least 6 characters;
Username cannot start with a number;
Username can only contain letters or numbers.
If valid, the username may be resgistered if it doesn't already exist in the system.
You should not use built-in functions to determine the character type such as isnumeric() or islower().
Use the strings given alphabet and numeric to determine if each character is valid.
Use the list registered to help you determine if the username is already registered.
Don't forget to execute the cell below to use these strings
# run this cell to create these variablesalphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'numeric = "0123456789"registered = ["john87", "topmage", "light4ever", "username2"]
Chapter 2 Solutions
Starting Out with C++ from Control Structures to Objects (9th Edition)
Ch. 2.1 - The following C++ program will not compile because...Ch. 2.3 - The following C++ program will not compile because...Ch. 2.3 - Study the following program and show what it will...Ch. 2.3 - Write a program that will display your name on the...Ch. 2.4 - Prob. 2.5CPCh. 2.4 - What will the following program display on the...Ch. 2.6 - Which of the following are illegal variable names,...Ch. 2.6 - Prob. 2.8CPCh. 2.6 - Prob. 2.9CPCh. 2.6 - Prob. 2.10CP
Ch. 2.8 - Prob. 2.11CPCh. 2.8 - Which of the following is a character literal? B BCh. 2.8 - Prob. 2.13CPCh. 2.8 - Write a program that has the following character...Ch. 2.8 - What is wrong with the following program...Ch. 2.8 - Prob. 2.16CPCh. 2.8 - Write a program that stores your name, address,...Ch. 2.11 - Prob. 2.18CPCh. 2.11 - Prob. 2.19CPCh. 2.11 - Prob. 2.20CPCh. 2.14 - Is the following assignment statement valid or...Ch. 2.14 - How would you consolidate the following...Ch. 2.14 - What is wrong with the following program? How...Ch. 2.14 - Prob. 2.24CPCh. 2.16 - Prob. 2.25CPCh. 2 - How many operands does each of the following types...Ch. 2 - How may the double variables temp, weight, and age...Ch. 2 - Prob. 3RQECh. 2 - Write assignment statements that perform the...Ch. 2 - Is the following comment written using single-line...Ch. 2 - Is the following comment written using single-line...Ch. 2 - Modify the following program so it prints two...Ch. 2 - What will the following programs print on the...Ch. 2 - Multiple Choice 9. Every complete statement ends...Ch. 2 - Prob. 10RQECh. 2 - Every C++ program must have a ________. A) cout...Ch. 2 - Preprocessor directives begin with ________. A) #...Ch. 2 - The following data 72 'A' Hello World" 2.8712 are...Ch. 2 - A group of statements, such as the contents of a...Ch. 2 - Which of the following are not valid assignment...Ch. 2 - Which of the following are not valid cout...Ch. 2 - Assume w = 5, x = 4, y = 8, and z = 2. What value...Ch. 2 - How would each of the following numbers be...Ch. 2 - The negation operator is ________. A) unary B)...Ch. 2 - A(n) ___________ is like a variable, but its value...Ch. 2 - Prob. 21RQECh. 2 - T F A variable must be defined before it can be...Ch. 2 - T F Variable names may begin with a number.Ch. 2 - T F Variable names may be up to 31 characters...Ch. 2 - T F A left brace in a C++ program should always be...Ch. 2 - T F You cannot initialize a named constant that is...Ch. 2 - Prob. 27RQECh. 2 - Convert the following pseudocode to C++ code. Be...Ch. 2 - There are a number of syntax errors in the...Ch. 2 - Sum of Two Numbers Write a program that stores the...Ch. 2 - Sales Prediction The East Coast sales division of...Ch. 2 - Sales Tax Write a program that will compute the...Ch. 2 - Restaurant Bill Write a program that computes the...Ch. 2 - Average of Values To get the average of a series...Ch. 2 - Annual Pay Suppose an employee gets paid every two...Ch. 2 - Ocean Levels Assuming the oceans level is...Ch. 2 - Total Purchase A customer in a store is purchasing...Ch. 2 - Cyborg Data Type Sizes You have been given a job...Ch. 2 - Miles per Gallon A car holds 15 gallons of...Ch. 2 - Distance per Tank of Gas A car with a 20-gallon...Ch. 2 - Land Calculation One acre of land is equivalent to...Ch. 2 - Circuit Board Price An electronics company sells...Ch. 2 - Prob. 14PCCh. 2 - Triangle Pattern Write a program that displays the...Ch. 2 - Diamond Pattern Write a program that displays the...Ch. 2 - Stock Commission Kathryn bought 750 shares of...Ch. 2 - Energy Drink Consumption A soft drink company...Ch. 2 - Annual High Temperatures The average July high...Ch. 2 - How Much Paint A particular brand of paint covers...
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