Strings

Question 1

When does null terminator need to be included in a string?

Answer 1

Using string functions

Question 2

‘\0’

Answer 2

NULL Terminator

Question 3

strlen argument(s)

Answer 3

char *

Question 4

What does strlen return?

Answer 4

Int; Index of first NULL Terminator

Question 5

What should you do instead of

while (i < strlen(str)) {
…
}

Answer 5

while(str[i] != ‘\0’) {
…
}

Question 6

Find length of string

Answer 6

strlen

Question 7

strcpy arguments

Answer 7

2 char *s; destination, source

Question 8

What does strcpy return?

Answer 8

char *; pointer to destination

Question 9

Given strings a and b, what should you do instead of:

a = b;

Answer 9

strcpy(a, b);

Question 10

Store word “Apple” into string str

Answer 10

char str[5+1];
strcpy(str, “Apple”);

Question 11

Joins two strings together in c.

Answer 11

strcat

Question 12

strcat arguments

Answer 12

2 char *s; destination and source

Question 13

What does strcat return?

Answer 13

char *; destination

Question 14

Mnemonic way to think about strcpy

Answer 14

strcpy(a,b) is a = b

Question 15

Mnemonic way to think about strcat

Answer 15

strcat(a,b) is a += b

Question 16

Mnemonic way to think about strcmp

Answer 16

strcmp(a, b) is a - b

Question 17

What does strcmp(“a”, “A”) return?

Answer 17

Positive int

Question 18

What does strcmp(“A”, “a”) return?

Answer 18

Negative int

Question 19

What does strcmp(“z”, “A”) return?

Answer 19

Positive int

Question 20

What does strcmp(“A”, “z”) return?

Answer 20

Negative int

Question 21

What does strcmp(“a”, “z”) return?

Answer 21

Negative int

Question 22

What does strcmp(“z”, “a”) return?

Answer 22

Positive int

Question 23

What does strcmp(“a”, “aa”) return?

Answer 23

Negative int

Question 24

What does strcmp(“aa”, “a”) return?

Answer 24

Positive int

Question 25

fgets argument(s)

Answer 25

First: char *; destination
Second: int; size of char array
Third: File *; source; usually stdin

Question 26

Function that reads a full line up to and including newline characters.

Answer 26

fgets

Question 27

When using fgets, what happens if the input is larger than the expected size?

Answer 27

As much of the input is written as possible with room for the null terminator at the end

Question 28

How big should you make a char array to hold information from fgets?

Answer 28

MAX_LINE_SIZE + 2

Question 29

What string function returns the index of the first NULL terminator?

Answer 29

strlen