Chapter 3 : Data and C

1. Which data type would you use for each of the following kinds of data(sometimes more than one type could be appropriate)?

a. The population of East Simpleson

b. The cost of a movie on DVD

c. The most common letter in this chapter

d. The number of times that the letter occurs in this chapter

a. int  b. float  c. char  d. int

2.    Why would you use a type  long  variable instead of type  int ?  

one reason is that long may accommodate larger numbers than int on your system; another reason is that if you do need to handle larger values, you improve portability by using a type guaranteed to be at least 32 bits on all systems.

3.    What portable types might you use to get a 32-bit signed integer, and what would the rationale be for each choice?    

To get exactly 32 bits, you could user int32_t, provided it was defined for your system. To get the smallest type that could store at least 32 bits, use int_least32. And to get the type that would provide the fastest computations for 32 bits, choose int_fast32_t.

4.    Identify the type and meaning, if any, of each of the following constants: 

a.    ''      

b.    1066      

c.    99.44

d.    0XAA

e.    2.0e30

a. char constant(but stored as type int)

b. int constant

c. double constant

d. unsigned int constant, hexadecimal format

e. double constant

6.    Identify the data type (as used in declaration statements) and the  printf()  format specifier for each of the following constants: 

Constant	Type	Specifier
a. 12	int	%d
b. 0X3	unsigned int	%#x
c. ‘C’	char(really int)	%c
d. 2.34E07	double	%f
e. '040'	char(really int)	%c
f. 7.0	double	%f
g. 6L	long	%ld
h 6.0f	float	%f
i 0x5.b6p12	float	%a

     
   7.    Identify the data type (as used in declaration statements) and the  printf()  format specifier for each of the following constants (assume a 16-bit  int ):  
 

Constant	Type	Specifier
a. 012	unsigned int	%#o
b. 2.9e05L	long double	%Le
c. 's'	char(really int)	%c
d. 100000	long	%ld
e. ' '	char(really int)	%c
f. 20.0f	float	%f
g. 0x44	unsigned int	%x
h. -40	int	%d

8.    Suppose a program begins with these declarations: 

int imate = 2;  
long shot = 53456;  
char grade = 'A';  
float log = 2.71828;   

Fill in the proper type specifiers in the following  printf()  statements: 

printf("The odds against the %__ were %__ to 1.
", imate, shot);  
printf("A score of %__ is not an %__ grade.
", log, grade); 

%d %ld

%f  %c

9. Suppose that  ch  is a type  char  variable. Show how to assign the carriage-return character to  ch  by using an escape sequence, a decimal value, an octal character constant, and a hex character constant. (Assume ASCII code values.)    

ch = '
';
ch = 13;
ch = '15';
ch = 'xd';

11.    Identify what each of the following escape sequences represents: 

a.        

b.    \      

c.    "    

d.   

a. A newline character

b. A backslash character

c. A double quotation character

d. A tab character