Cpsc 1110 Final Exam

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Questions

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Answers

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The standard input file that C opens for you is

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stdin

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The gcc -Wall option means...

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display all warnings

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If you had two relational expressions and you wish to return true only if both of the expressions are true, you would use...

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&&

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The value that will be interpreted as a false boolean value is...

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0

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The return statement...

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sets a function's return value anddddd returns the invoking function.

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The escape sequence in a format string that is used to go to the beginning of the next line is...

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\n

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If you had two relational expressions and you wish to return true if eithe rof the expressions is true, you would use...

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| |

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A line comment begins with ...

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//

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gcc is an exampel of a...

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compiler

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To pass the address of a variable to the scanf function you would use the ________ operator.

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&

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A block comment begins with ___ and ends with ___.

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/*, */

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The #include statement is an exampel of a _____ statement.

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Preprocessor

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All of the following are ways to subtract 3 from num except...

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num - 3 = num;

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A block of executable code is indicated to gcc by ...

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enclosing it in braces

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The file produced by "gcc -Wall myProg.c" is ...

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a.out

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The data type that should be returned by main is

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int

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to use standard input and output functions, you generally #include

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The repetition statement that will always execute the body of the loop at least once is the....

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do while

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Given: int var1, var2; - What is the set of code below that reads in two whole numbers into the variables?

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scanf("%d %d", &var1, &var2);

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String literal constants are enclosed in ____

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double quotes

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The gcc -lm option means ____

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bind with the math library machine code

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would war-peace be a valid or invalid identifier name to gcc?

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invalid b/c of the -

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would 3rd_year be a valid or invalid identifer name to gcc?

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invalid b/c starts with #

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If you had two arithmetic expressions adn you wish to return true if the first is NOT equal to the second you would use...

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!=

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Parameters passed to a function are passed by....

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value

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Given an array b for which the subscript of the last element is 100 and each element is 4 bytes long, sizeof(b) is ___.

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404

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Before a funciton can be used, a function's ___ MUST be defined.

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prototype or definition

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The keyword ___ is used in a functions header to indicate that the function does not return a value.

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void

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If you reference outside the bounds of an array, ____

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The program will not check the subscript and the results are unpredictable

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If you pass an arrya to a function and the function modifies an array element, ___

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the actual array element will be modified

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A variable defined outside of all functions

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can be used in any function after the definition

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The data types of function parameters must be specified to the compiler in ____

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the function header

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To reference the last element of array a of 25 elements you would specify...

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a[24]

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The _____ statement in a called function is ued to pass the value of an expression back to the call function.

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return

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To implement a list in a program you would use a ___.

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one-dimensional array

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Value-returning functions return ___ after the tast is completed.

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a single value

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to reference the first element of array a, you would specifiy

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a[0]

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An array subscript is always a ____

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integer

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If there are fewer initial values specified for an array than the number of elements in the array, the remaining elements are initialized to ____.

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0

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A ____ allows the compiler to check the number, types and order of the arguments passed to a function befoer the function has been defined.

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function prototype

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For a one dimensional array in a function definition header paramerter, the array's ____ is generally specified since it is ignored.

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size

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Local variables defined in a function block are normally unallocated ____.

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at the end of the function block

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The area in which a variable can be referenced is its

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scope

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A ____ should be used to specify the size of an array to make the program easier to change if the array needs to be changed.

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named constant

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When specifying initial values for an array, the initial values are separated by _____.

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commas

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The value that the main function returns to the operating system indicates ____

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whether the program ended normally

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When you specity initial values for a one-dimensional array and leave out the size, ___

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the compiler will compute the size

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(True or false) Every C prgoram contains at least one function.

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TRUE

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The block of code for a function is recognized by the compiler because it is _____.

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enclosed in braces

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The keyword ___ specifies that a local variable is to maintain its value after a funciton ends.

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static

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To define an integer array with 25 elements you could specify

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int a[25];

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A function is invoked with a ....

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function call

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(True or false) An individual array can store data of different C data types

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FALSE

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What is the form that will DYNAMICALLY allocate an arry of 100 integers from the heap?

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int *nums = (int *) malloc(sizeof(int) * 100);

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An array declared as: float sales[11][26] has how many rows and how many columns?

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11 rows and 26 columns

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The function calloc returns a pointer to a variable of type ____.

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void

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If an int variable x is to be passed to a function y simulating by reference, the PARAMETER LIST in the definition of y should contain....

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int *x

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Given teh execution of a program with the command ./a.out data_in.txt data_out.txt the value of the first paramter to main will be____.

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3

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The fopen modes for input, output create and output append are ___, ____, and ____.

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"r", "w", and "a"

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To compare two strings to see if they are equal, you use ___.

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strcmp

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The FILE function used to read from a sequential text file is ____.

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fscanf (fgetf reads spaces, fscanf does not)

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Strings are implemented in C as ____.

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char array

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To indicate that a pointer has no value assigned, it should be given a value of ___.

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NULL

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A pointer variable contains as its value the ___ of another variable.

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Address

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The character used to indicate the end of a string is ___

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\0

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The dynamic memory function that initializes memory to BINARY ZEROS is ____.

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calloc

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If the path to a file is not specified, the file location is assumed to be ____.

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The current directory.

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An array declared as: int score[6][12] has ____ int variables.

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72

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The final function call for an open file should be ____.

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fclose

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Which of the following declares the variable prt to be a pointer to a memory location that stores a double.

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double *ptr;

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If fopen cannot open a file, it returns ____.

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NULL

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The format placeholder to print out a string of text is ____.

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%s

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THe function fscanf's first argument is ___.

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fp, the file pointer

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Which will deallocate an array of 100 integers pointed to by aPtr

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free(aPtr);

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The function used to determine the lenght of a string is ____.

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strlen

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The SAFE function for reading a string that CAN CONTAIN SPACES is ____

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fgets

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If an int variable x is to be passed to a function y simulating by reference, the CALL to y should contain....

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&x

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The FILE function used to write to a SEQUENTIAL text file is ____.

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fprintf

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Which of the following will pass an array of 100 integers ointed to by aPtr and the number of elements to a void function named read_nums?

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read_nums(aPtr, 100);