Exam 1 review COP3223C

Who developed the C programming language? 

Dennis M. Ritchie

When was C first implemented?

1972

Why is C widely used?  Select all that apply.

It can handle low-level activities

Structured language

Easy to learn

It can be compiled on a variety of computer platforms

Which language is C the successor of?

B

C runs nearly as fast as which other language?

Assembly language

What is the file extension of a C language source code file?

.c

What tools are required to set up an environment in order to write, compile, and run a program written in the C language?  Select all that apply.

Text editor

C compiler

What type of file contains the source code?

source files

What is source code compiled into?

machine language

Match the parts of the program with its definition.

-----------------------------------------------------------------

#include <stdio.h>

int main()
{
/* my first program in C */
printf("Hello, World! \n");

return 0;
}

#include <stdio.h> : preprocessor command

int main(): the main function where the programs execution begins

/* my first program in C */ : comments

 printf("Hello, World! \n"); : function available in C

return 0; : terminates the main() functions

Given the source code below, how many tokens make up the statement?

printf("Hello COP 3223!");

5

In a C program, an individual statement must be ended with a semicolon.

True

There are multiple formats of an acceptable comment in C, select all that apply.

/* comment */

// comment

Regarding identifiers for variables, functions, or any other user-defined item, which of the following are acceptable?  Select all that apply.

_variable

var23iable

variable

VARIABLE

Regarding keywords in the C programming language and creating identifiers.  Keywords are reserved in all lowercase AND all uppercase.

False

Regarding whitespace in the C programming language, spaces are required between the operators in the following source code in order to compile, run, and provide the correct output.

int sum=2+3/2-12*15;

False

Match the data type to its definition.

Basic Types

Enumerated types

void

Derived types

Aggregate types

Basic Types: Arithmetic types are further classified into integer and floating point types.

Enumerated types: Used to define variables that can only assign certain discrete integer values.

void: No value is available

Derived types: pointer, array, structure, union, Function types

Aggregate types: array and structure

What C operator is used to yield the storage size of the object or type in bytes?

sizeof(type)

Given the three situations the void type is used in C, match the associated code with the situation.

Function returns as void: void exit (int status);

Function arguments as void: int rand(void);

Pointers to void: void*malloc( size_t size )

Which of the following is true regarding a variable in C?  Select all that apply.

the data type determines the range of values that can be stored

the data type determines the set of operations that can be applied to the variable

the data type determines the layout of the variable's memory

has a specific type

the data type determines the size of the variable

Regarding basic data types in C, match the data type to its definition.

Char: typically one byte and is an integer

int: the most natural size of integer for the machine

float: a single precision floating point value

double: a double precision floating point value

void: represents the absences of type

A variable definition must include as a minimum which of the following?  Select all that apply.

int variableName = 53;

Data type

Semi-colon

Valid name

Which of the following is true regarding variable definition in C?  Select all that apply.

is useful when you are using multiple files

has its meaning at the time of compilation only

provides assurance to the compiler that there exists a variable with the given type and name

Constants can be altered during program execution.

False

Professional best practices state that when using constants in source code the syntax should be in which format?

upper case

Literals are not equivalent to fixed values in regard to computer programming in the C language. 

False

Which of the following is the correct implementation for defining a constant as a macro?

#define RATE 25

When defining a constant as a macro where should it be located?

outside all functions

When defining a constant in the main() function, which of the following is the correction implementation?

const int LENGTH = 10;

What does a storage class define regarding variables?

scope

life-time

visibility

Match the storage class to its definition.

auto

register

static

extern

auto: is the default storage class for all local variables

register: to define local variables that should be stored in a register instead of RAM

static: instructs the compiler to keep a local variable in existence during the life-time of the program

extern: to give a reference of a global variable that is visible to ALL the program files

Match the operator to its functionality.

+

*

%

--

==

+: adds two operands

*: multiplies two operands

%: remainder after integer division

--: decrements integer by one

==: checks if two operands are equal

Match the operator to its functionality.

>=

!=

!

||

&

>=: checks if left operand is greater than or equal to the right operand

!=: checks if two operands are not equal

!: used to reverse the logical state of its operand

||: if any of the two operands is non-zero, then the condition becomes true

&: bitwise AND

Match the operator to its functionality.

=

/=

sizeof()

?:

-=

=: assigns values from right side operands to left side operand

/=: it divides the left operand with the right operand and assigns the result to the left operand

sizeof(): returns the size of a variable

?:- conditional expression; if condition is true ? then value X : otherwise value Y

-=: it subtracts the right operand from the left operand and assigns the result to the left operand