Mops Exam 2 Review

I/O

100

Which file open mode will not create a new file is the given one does not exist?

r (read)

200

What does the function fgetc() do?

Gets one character from a file.

300

Which function writes to a file in binary?

fwrite

400

Which function sets the position in the given file to the given offset?

fseek

500

Finish the line below so that it opens the .c file of the current program to read it in binary.

FILE * file =

FILE * file = fopen(__FILE__, "rb");

Bitwise

100

What is the operation for inverting all bits?

~, complement

200

1011 ^ 1100 =

0111

300

1001 << 2 =

0100

400

char a = 0xf2;

a >> 4 =

0xff

500

unsigned char a = 0b10001000;

char b = 0b11110000;

~a & b || 0b00110011=

1

ADTs

100

What is the purpose of an ADT?

To hide implementation from the user.

200

The ________ for an ADT serves as the interface for the client.

Header file

300

How should the struct for an ADT be made available in the header file?

Using a typedef

400

Write a basic constructor for an ADT called "CoolADT"

The struct is called "struct coolADT_s" and the header file is the following:

typedef struct coolADT_s * CoolADT;

CoolADT cool_create();

CoolADT cool_create(){
    CoolADT newCool = (CoolADT) malloc(sizeof(struct coolADT_s));

    return newCool;

}

500

I couldn't think of any more ADT questions, so here's a random one:

What is the output of this code?

int x(){ return 10;}

int y(){ return 20;}

int main(){

     int a = ( x(), y() );

     printf("a=%d", a);

     return 0;

}

20

C programming

100

This qualifier asks the compiler to store the variable in a CPU register.

Register

200

This qualifier tells the compiler to not optimize code.

Volatile

300

Define a function pointer called function with a single int parameter and which does not return anything.

void (*function)(int a);

400

Create a struct with bitfields for a specialized chip:

- 2 bits specify input

- 1 bit specifies a flag

- 5 bits are used for data

struct bitField{

    unsigned char input : 2;

    unsigned char flag : 1;

    unsigned char data : 5;

};

500

What is the size of the union below?

union u{

     char c[8];

     int i[4];

     void * v[3];

     double d;

     unsigned short s[10];

};

24 bytes

Grab bag

100

C is ____ type-checked, which occurs at compile time.

Statically

200

C is ____ typed, which means you can get around type restrictions.

Weakly

300

What integer value does Thursday have in enum days?

enum days{ Sunday = 4, Monday, Tuesday = 0, Wednesday, Thursday, Friday = 11, Saturday };

2

400

What would the dependency tree of the following makefile look like?

CC=gcc

CC_FLAGS=-Wall -Wextra -pedantic -std=c99

main: main.o list.o person.o

    $(CC) $(CC_FLAGS) -o main main.o list.o person.o

main.o: main.c list.h person.h

    $(CC) $(CC_FLAGS) -c main.c

list.o: list.c list.h

    $(CC) $(CC_FLAGS) -c list.c

person.o: person.c person.h

    $(CC) $(CC_FLAGS) -c person.c

500

Given the following defines:

What is the result of the following code?

#define ADD4(x)    4+x

#define SQU(y)     y*y

int main( void ){

    int a =  3;

    printf("%d\n", SQU(ADD4(a)));

    return 0;

}

19