Procedure Call Explanation concat (str1, Returns a single string consisting of strl followed by str2. For example, concat ("key", "board") returns "keyboard". str2) Returns the first length characters of str or str if length is greater than the number of characters in str. For example, prefix("delivery", 3) returns del" and prefix("delivery", 100) returns "delivery". prefix(str, length) The variable initials is to be assigned a string consisting of the first letter of the string firstName followed by the first letter of the string lastName. Which of the following assigns the correct string to initials?

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Control structures

Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.

Switch Statement

The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.