12th Class Computer Science Chapter 13 Short Questions with Answers Online Preparation

Question # 1

Question # 2

Ans 1: Built-in function are not sufficient for solving every kind of problem . A programmer may need to write his/her own functions depending on the nature of problem being solved.
Such functions are called user-defined functions.

Question # 3

Question # 4

Ans 1: A Function prototype is a statement that provides the basic information that the compiler needs to check and use a function correctly. It specifies the parameters to be passed to the function,the function name , and type of the return value.
The general form of the function prototype is as follows:
return _ type FunctionName (paramete_list)
The prototype for a function which is called form another function must appear before the function call statement.Function prototypes are usually placed at the beginning of the source file just before the function header of the main function.

Question # 5

Question # 6

Ans 1: Local Variable: All variables that we have declared so far are declared within a block - that is, within the extent of a pair of curly braces. These are called local variables is form the point in the program where it is declared until the end of the block containing its declaration .
Ans 2: Global Variable: The variable which are declared outside all blocks i.e outside the main ( ) and all other functions,. The scope of a global variable is form the point where they are declared until end of the file containing

Question # 7

Ans 1: Built in Function: built in function are predefined functions that provide us convenient ways to perform variety of tasks. Theses functions are packaged in libraries.Through these function we can easily access complex programming functionally. We should not reinvent the wheel. All that we need to do is just making a function call and the rest of the task is performed by the called function

Question # 8

Ans 1: Function call is mechanism that is used to invoke a function to perform a specific task. A function call can be invoked at any point in the program. In C the function name,the arguments and the statement terminator( ;) are specified to invoke a function call .
When function call statement is executed , it transfer control to the function that is called.The memory is allocated to variables declared in the function and then the statements in the function body are executed. After the last statement in the function is executed, control returns to the calling function.

Question # 9

Ans 1: The lifetime of global variable is until the termination of the program. They exist in memory from the start to the end of the program.

Question # 10

Ans 1: Scope of Global Variables: They are accessible from the point where they are declared until end of the file containing them. It means they are visible throughout all the functions in the file, following their point of declaration. The life time of global variable is until the termination of the program. They exist in memory from the start to the end of the program.