Chapter 12, Problem 1MC

Program Description Answer

Display str[0]:

The above statement is used to display the first character of the string “str”.

Hence, the correct answer is option “B”.

Explanation of Solution

Character by character text processing:

• Strings can be accessed or manipulated by using an individual text that is present.
• Different programming language access the string individually in a different way, some prefer the string gets accessed through subscript notation.
• String is considered as list of characters.

Accessing string using subscript notation:

• The string that are accessed using the subscript notation uses subscript “0” to hold the first character and similarly till the last character.
• The first value the index value will be “0” and to find the last character use “length(variable)-1”.

Example:

//declare and define a string

Declare String txt = "Hai"

Explanation:

In the above declaration, the given string  gets processed in the following way:

txt[0] will hold “H”.

txt[1] will hold “a”.

txt[2] will hold “i”.

Explanation for the incorrect answer:

Display str[1]:

The above statement is used to display the second character of the “str” string.

Hence, the option “A” is wrong.

Display str[first]:

The above statement is used to display the character present at the value of “first” , ”,(that is the value that variable last holds ) of the “str” string.

Hence, the option “C” is wrong.

Display str:

The above statement is used to display the entire content of the string “str”.

Hence, the option “D” is wrong.