Chapter 2: Data Types and Arithmetic Expressions TRUE/FALSE
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1 Chapter 2: Data Types and Arithmetic Expressions TRUE/FALSE 1. Data can take many forms, including numbers, individual alphabetic characters, strings of alphabetic characters, and numbers with specific decimal precision. ANS: T PTS: 1 REF: NSLog provides an extended set of functionality for outputting information such as the option to format data. ANS: T PTS: 1 REF: NSLog takes at least two string parameters. ANS: F PTS: 1 REF: The \n in the NSLog statement: NSLog(@"Please enter a number\n"); is a number specifier. ANS: F PTS: 1 REF: In the Objective-C statement: scanf("%d", &num); &num is the name of a variable in which a number will be stored. ANS: T PTS: 1 REF: The Objective-C int data type is used to store a whole number that does not have a decimal point. ANS: T PTS: 1 REF: The Objective-C char data type is used to store strings of characters. ANS: F PTS: 1 REF: The Objective-C float data type is used to store real numbers. ANS: T PTS: 1 REF: In the expression: int *prtvalue = &value; the & symbol before the variable named value gives its address location. ANS: T PTS: 1 REF: The Objective-C id data type is typically used to point to an object of an unknown data type. ANS: T PTS: 1 REF: 23
2 11. The struct functionality in Objective-C allows a programmer to define a new data type with enumerations. ANS: F PTS: 1 REF: In Objective-C, the values assigned to enumerations are of integer type. ANS: T PTS: 1 REF: In the Objective-C statement: typedef enum {Jan, Feb, March, April, May} Month; the value of April is 4. ANS: F PTS: 1 REF: The #define statement in Objective-C is an example of a preprocessor. ANS: T PTS: 1 REF: An advantage of using constants in a program is that, if the value of the constant needs to be changed, the programmer only needs to change it in one location rather than searching the entire program and modifying every instance. ANS: T PTS: 1 REF: Expressions that contain operands and operators are called arithmetic expressions. ANS: T PTS: 1 REF: If the Objective-C operator div is used with integers and there is a nonzero remainder, it will round up or down to the nearest integer. ANS: F PTS: 1 REF: You can use either pre or post increment notation for increment operations since the results are always the same. ANS: F PTS: 1 REF: The Objective-C pre increment operator will first evaluate the expression and then perform the increment after the expression is evaluated. ANS: F PTS: 1 REF: The Objective-C subtract and assign operator, -=, first subtracts a value from a variable and then assigns this new value to the variable. ANS: T PTS: 1 REF: 32 MULTIPLE CHOICE 1. To store data, a program requires placeholders. A placeholder holds data that changes as the program runs.
3 a. constant c. string b. variable d. concatenated ANS: B PTS: 1 REF: Data types help the Objective-C language allocate memory for storage. a. compiler c. memory manager b. interpreter d. programmer ANS: A PTS: 1 REF: In Objective-C, concatenation is the process of combining multiple into a single element. a. addresses c. variables b. numbers d. strings ANS: D PTS: 1 REF: is identified by Apple as an error log mechanism used to output data to the console. a. Scanf c. NSLog b. NSError d. NSOutput ANS: C PTS: 1 REF: The NSLog function uses specifiers which are tokens that start with the symbol %, followed by a character that specifies a data type. a. data-type c. foundation b. format d. parameter ANS: B PTS: 1 REF: NSLog takes one or more parameters in the form of a string with format specifiers. The string with the format specifier starts with the symbol. a. % c. & d. # ANS: B PTS: 1 REF: reads input typed by the user. a. Read c. Getf b. Readline d. Scanf ANS: D PTS: 1 REF: In the Objective-C statement: scanf( %f, &num); the variable num has a type of. a. decimal c. integer b. real d. float ANS: D PTS: 1 REF: When using the scanf method in code that requires the user to enter data that will be stored as a double, you should use the format specifier. a. %n c. %f b. %ld d. %lf ANS: D PTS: 1 REF: 18
4 10. The data type is used to store a whole number that does not have a decimal point. a. char c. float b. int d. double ANS: B PTS: 1 REF: The data type is used to store a single character. a. int c. character b. char d. string ANS: B PTS: 1 REF: The storage space utilized by an Objective-C float is bits. a. 8 c. 64 b. 32 d. 128 ANS: B PTS: 1 REF: The storage space utilized by an Objective-C double is bits. a. 8 c. 64 b. 32 d. 128 ANS: C PTS: 1 REF: Various combinations of basic data types can be used to create more complex data types. What are these data types called? a. complex c. derived b. combined d. double ANS: C PTS: 1 REF: The type holds a memory location where data is stored. a. pointer c. main b. id d. struct ANS: A PTS: 1 REF: In Objective-C code, a variable of type is created by using the * symbol. a. char c. pointer b. struct d. id ANS: C PTS: 1 REF: a pointer means extracting the value the pointer is pointing to. a. Dereferencing c. Releasing b. Extracting d. Deriving ANS: A PTS: 1 REF: The Objective-C NSLog format specifier for a pointer variable is. a. %d c. %n b. %v d. %p ANS: D PTS: 1 REF: Given the following code segment:
5 int num = 5; int * ptrvalue; ptrvalue = # where the memory address holding num is 0x7fff c, the output from the statement NSLog(@ %d,*ptrvalue) is. a. 5 c. num b. 0x7fff c d. 5 0x7ff c ANS: A PTS: 1 REF: The type is a generic data type that stores data of any type. a. id c. pointer b. struct d. gen ANS: A PTS: 1 REF: The type is a combination of several data types that creates a new custom data type. It is a remnant of the original C language, before object oriented programming was introduced. a. id c. pointer b. struct d. gen ANS: B PTS: 1 REF: Given the following Objective-C code segment: struct ball { int num; float size; char color; }; struct ball b; which of the following statements would set the value of the property num of the newly created variable to 5? a. ball.num = 5; c. struct.ball = 5; b. b.num = 5; d. struct.b = 5; ANS: B PTS: 1 REF: notation is used to populate and retrieve the values of variables in a structure. a. Char c. Dot b. Struct d. # ANS: C PTS: 1 REF: In Objective-C, the term means a defined range of values for a variable. a. itemization c. list b. enumeration d. inventory ANS: B PTS: 1 REF: In the following section of code, the programmer did not specify the value that should be associated with each month.
6 typedef enum { Jan, Feb, March, April, May, } Month; By default, the first month, Jan, will be assigned the value. a. 0 c. %undefined b. 1 d. %error ANS: A PTS: 1 REF: The in Objective-C is a special tool that helps you create custom statements. a. debugger c. importer b. compiler d. preprocessor ANS: D PTS: 1 REF: The Objective-C statement is used to define constants and associate them with unique names. a. #const c. #define b. #preprocess d. #customize ANS: C PTS: 1 REF: Objective-C arithmetic operators can be divided into basic and assignment operators. a. compound c. modulus b. complex d. enumerated ANS: A PTS: 1 REF: The character % represents the Objective-C basic assignment operator. a. percent c. assign b. modulus d. divide ANS: B PTS: 1 REF: Given that the integer num1 = 24 and the integer num2 = 15, the value of the variable div in the expression: div = num1 / num2 is. a. 0 c. 1 b..625 d. 1.6 ANS: C PTS: 1 REF: The modulus operator returns the after division. a. divisor c. remainder b. dividend d. quotient ANS: C PTS: 1 REF: The Objective-C modulus operator only works on.
7 a. real numbers c. doubles b. floats d. integers ANS: D PTS: 1 REF: To produce the output, 7 % 2, in Objective-C, you could use the statement: NSLog(@ 7 2 ). a. % c. % b. % d. %% ANS: D PTS: 1 REF: The Objective-C operator means increment by 1. a. += c. +/ b. ++ d. =+ ANS: B PTS: 1 REF: If x = 5, the expression ++x*2 evaluates to. a. 5 c. 11 b. 10 d. 12 ANS: D PTS: 1 REF: If x = 5, the expression x++*2 evaluates to. a. 5 c. 11 b. 10 d. 12 ANS: C PTS: 1 REF: The operator += is called a operator. a. conjunctive c. complex b. compound d. pre increment ANS: B PTS: 1 REF: If num1 = 2 and num2 = 3, the value of num1 after evaluating the expression num1 += num2 will be. a. 2 c. 5 b. 3 d. 7 ANS: C PTS: 1 REF: A shorthand method for writing the expression num1 = num1 * num2 is. a. num1 *= num2 c. num1 ++* num2 b. num1 *++ num2 d. num1 == num2 ANS: A PTS: 1 REF: If num1 = 6 and num2 = 4, after evaluating the expression num1 %= num2 the value of num1 is. a. 2 c. 6 b. 4 d. 10
8 ANS: A PTS: 1 REF: 34
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