Question

What is the function substr(X, Y, Z) used for?

1) X is the string from which the substring is extracted, Y is the starting position of the substring, and Z is the length of the substring
2) X is the substring to be replaced, Y is the string in which the replacement will occur, and Z is the replacement string
3) X is the string to be split, Y is the delimiter used for splitting, and Z is the maximum number of splits
4) X is the string to be concatenated, Y is the string to be appended, and Z is the position at which the appending will occur

Answer 1

The correct function usage is substr (X, Y, Z) where X is the string from which the substring is extracted, Y is the starting position of the substring, and Z is the length of the substring. Option A is answer.

Step-by-step explanation:

The substr (X, Y, Z) function is used to extract a substring from a given string X. The second parameter Y denotes the starting position of the substring within X, and the third parameter Z specifies the length of the desired substring. This function is commonly used in programming languages like JavaScript and Pe-rl for manipulating strings, allowing developers to extract a portion of a string based on a specified starting position and length.

Options 2, 3, and 4 describe functions related to string replacement, splitting, and concatenation, respectively, but they do not match the intended purpose of substr.

Option A is the answer.