Week 9 Quiz

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Week 9 Quiz

The data type for character is similar to that of integer in several ways. Is it possible to use various comparison operators on char values (e.g. 'a' > 'C' )?

Only equivalence ( == ) comparison is allowed

All comparison operators ( >=, <=, >, <, ==, !=) can be used for char values

No comparison can be done on char values

It is possible use any comparison operators as long as char variables are not referenced in the comparison statement

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By using the ASCII table, we can search for the integer equivalent for some char value. What are the integer equivalents for char values 'a' and 'A', respectively?

0 and 26

0 and 65

65 and 97

97 and 65

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One way that we have learnt to scan user inputs is to use the scanf function. What is another function we can use to scan for a character input?

getchar()

putchar()

scanchar()

takechar()

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Numbers ( '0' - '9' ) are also valid character values. What would be the result of integer 5 + character '2' ?

Note that all the answers refer to integer values

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ctype.h offers a list of functions that can be used on a character. What function can be used to check if a character is a upper case letter?

isAlpha()

isAlnum()

isUpper()

toUpper()

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John has typed "apple" and pressed the enter key for inputting a string into a program through the fgets function. What would be the size of the character array required to hold the string in this scenario?

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A string can be considered as an array of characters. Is it possible to initialise the string (just like an integer array of any dimensions)? If so, how should the initialisation be done?

Assume the character array declared here is called arr, with a constant SIZE defined as 10 .

No, initialisation is not possible.

char arr[SIZE] = "";

char arr[SIZE] = {""};

char arr[SIZE] = {{""}};

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While characters have "ctype.h", strings have "string.h" for various functions. What function can be use to find the occurrence of a constant string in a character array?

strchr()

strstr()

strlen()

strtok()

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When looking through the functions offered by "string.h", you might find that there are often two variants for one purpose (such as strcpy and strncpy). What is the key difference between the two variants?

One variant runs with the pointer N that is within the string.

One variant runs with the character N that is used for the operation.

One variant runs with the size N that is used for the operation.

There is no difference. string.h just offers two options for performing one task.

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In the past few weeks, we have looked at how to use different data types on different types of operations. Which of the following is not applicable for a string?

Use a switch statement to check for string equivalence.

Use nested if - else statements to check certain indexes of the string.

Use a for - loop to print out each index of the string character by character.

All the above would work.

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