When are the codes inside the function executed? Can you identify which is the global variable and the local variable?
Question
When are the codes inside the function executed? Can you identify which is the global variable and the local variable?
Solution
-
The codes inside a function are executed when the function is called. A function call is made by using the name of the function followed by parentheses containing any required arguments. For example, if we have a function named
my_function, we would call it asmy_function(). -
A global variable is a variable that is declared outside of all function definitions in a program. It can be accessed and modified by any function within the program. For example, in the following code,
xis a global variable:
x = 10
def my_function():
print(x)
- A local variable, on the other hand, is a variable that is declared inside a function. It can only be accessed and modified within that function. For example, in the following code,
yis a local variable:
def my_function():
y = 5
print(y)
-
To identify whether a variable is global or local, you can look at where it is declared. If it is declared outside of all functions, it is global. If it is declared inside a function, it is local.
-
Additionally, in Python, you can use the
globalkeyword inside a function to declare that a variable is global. If you do this, any changes you make to the variable inside the function will affect the global variable. For example:
x = 10
def my_function():
global x
x = 5
my_function()
print(x) # Outputs: 5
In this example, x is a global variable. Inside my_function, we use the global keyword to declare that we want to use the global x. We then change x to 5. When we print x after calling my_function, it outputs 5, showing that the global x was changed.
Similar Questions
Provide the correct answer(s) in the blank(s) Global variables are declared outside of any function. A global variable is visible to any every function and can be used by any piece of code. Unlike local variable, global variables retain their values between function calls and throughout the program execution. Let us consider an example: #include < stdio.h > int a = 20; // Global declaration void test(); void main() { printf("In main() function a = %d\n", a); // Prints 20 test(); a = a + 15; // Uses global variable printf("In main() function a = %d\n", a); // Prints 55 } void test() { a = a + 20; // Uses global variable printf("In test() function a = %d\n", a); // Prints 40 } In the above code the global variable a is declared outside of all the functions. So, the variable a can be accessed in every function. Operating System calls the main() function at the time of execution. the variable a has no local declaration, so it access the global variable a. In test() function also there is no local declaration of variable a, the variable a gets access from the global. The global variables are destroyed only after completion of execution of entire program. What is the output for the following code #include <stdio.h> int a = 10; void test(); void main() { printf("In main() function a = %d\n", a); test(); a = a + 10; printf("In main() function a = %d\n", a); } void test() { a = a + 20; printf("In test() function a = %d\n", a); }
Which of the following is true about Python's global keyword?AIt can only be used inside functionsBIt makes a variable local to the functionCIt declares a variable as globalDIt prevents the use of global variables
Which one is false regarding global variables?Global variables can only be read inside the function declaring the variable as global inside the function.Global variables remain in memory till the end of the programGlobal variables are those which are declared in global scope.None of the above
Which of the following correctly describes the scope of a variable declared inside a function?Global scopeLocal scope to the functionStatic scopeFile scope
Fill in the blanks. __________are the variables declared inside a function. a. Immediate variables b. Global variables c. Local variables d. None of these
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.