Scope
What is variable scope? What are the types of scope we can have
in programming?
What type of scope does a variable have when it is defined within
a sub-block?
What is a global variable? How are they typically declared?
To modify a global variable inside of a function, what statement
must we have at the beginning
of the function’s body?
Why is using global variables considered poor programming
practice?
What is a constant variable? Can we have true constant variables
in Python?
What is the recommended programming style for naming constant
variables?
What is variable scope? What are the types of scope we can have in programming?
A scope in programming language can be define as the region or the part and the scope of the variable is the region where the variable is accessed after the declaration. i.e it is the area where we can access the variable and if we try to access the variable other than access region compiler will flag an error message as variable out of scope message.
A scope of the variable can be Local ,
Global and formal parameters.
A variable scope is local when we are going to use in Inside a function or a block.
example:
main()
{
int x ; // local variable
printf(x); // prints the vaue of x
}
function()
{
printf(x) // flags error... x is not defined..out of scope
}
It can be global when it is used Out of all functions.i.e accessible to all functions or throughout the program.
example:
int x ; // Global variable
main()
{
printf(x); // prints the vaue of x
}
function()
{
printf(x) // prints the value of x
}
Variable can also be used as the formal parameters where it is used in the function parameters.
What type of scope does a variable have when it is defined within a sub-block?
A variable defined inside a sub-block can only be used within that block.i.e it remains local to that block only and we cannot access that variable outside that sub block.
What is a global variable? How are they typically declared?
Since a program has variables or we can say that the representation of the memory blocks and we can use those variables in our program. Now there are restrictions for using these variables which can be controlled by the developer as given access to them. An access can be Local to the function of the respected program and it can be global to the program. Those variables which can be used throughout the program without any hindrance are defined as global. They can be used from any block or the function of the program. Below is the global variable declaration for the simple program.
example:
int x ; // Global variable
main()
{
int y;
printf(x); // prints the vaue of x
printf(y) // Local variable
}
function()
{
printf(x) // prints the value of x
}
To modify a global variable inside of a function, what
statement must we have at the beginning
of the function’s body?
In order to modify the value of the variable inside a function please follow the below code. Here i have showed how to modify ht e value of the global variable from the local function of the program.
Why is using global variables considered poor programming practice?
The reason for this is that it can be accessed from everywhere and makes it difficult to remember that lastest value and from where it has been accessed. i.e it remains in no access control state, and Using global variables causes very tight coupling of code.
What is a constant variable? Can we have true constant variables in Python?
No, there is no constant keyword in python and you can not declare the variable as constant in python
If you are in a class, the equivalent would be:
class function(object): CONST_Variable= "XYZ"
if not, it is just
CONST_Variable = "XYZ"
What is the recommended programming style for naming constant variables?
Recommended programming style for naming a constant variable is same as the variable but the only difference is to put Const keyword before the data type followed by the name of the constant variable.
Scope What is variable scope? What are the types of scope we can have in...
QUESTION 21 while True: , in Python, can be used to create an infinite loop. True False 2 points QUESTION 22 The Python Framework does inform you where an error occurred True False 2 points QUESTION 23 ____ is a critical component to being able to store data and information long term. File Access Memory Print function with 2 points QUESTION 24 Error handling is also known as ___ handling Result Recursion Exception Crash 2 points ...
CODE ONE #include #include using namespace std; string x =" I am global"; // Global x int main() { string x = " I am local"; // Local x cout< cout<<::x< return 0; } CODE TWO #include #include using namespace std; string str = "i am global ";// global int main() { string srt = "i am local to main() ";//local to main() cout << str << "---" << ::str << "\n";// LINE 5555. int x=5; int y=6; if...
How are variables charged metals How are variable charge metals (metals that can have more than one charge) named and how is this different than naming constant charge metals?
A Python 3 variable: A. can have a type in the same way variables are declared in C. B. can be assigned values of different types at different points within the same function. C. may be assigned the value of a list. D. may be assigned the value of a tuple. E. None of the above.
Ensure the following compiles 5. Variable scope (1 mark) Some variables are only accessible while executing specific code. Global variables are often thought of as evil because the state of a system can be altered making functions execute differently when it isn't expected. There is also the issue of block scope. For an example of block scope, see the file below. Notice that you don't get an error because the code uses the correct syntax. Although the syntax is correct,...
Please help! Thank You... 1. If we have to use a global variable, what technique can we use to easily identify it as such? 2. What is required to maintain a partially-filled array? 3. At what array size does it become beneficial to use a binary search instead of a linear search? ► 4. Describe what a min heap data structure can be used for. Include a picture of one.
Python Question 5 2 pts We have a dictionary d2 (NOTE THE VARIABLE NAME CHANGE), defined as follows, which maps words to the pages in a book that contain those words: d2-computer': [e, 11), programming [1, 19, 41, 60, 65, 89], is: [2, 54, 66], the: [3, 34, 48, 62, 76, 86, 1e1], process': [4, 87], of: [S, 36, 51, 64, 71, 78, 88, 10e], designing [6], and' [7, 30, 33, 1e6], building [8], an [9], executable': [10], program': [12,...
What do we call a characteristic that can be defined, measured, and takes on different values among sample subjects? A. Value B. Population C. Constant D. Variable E. Sample
Suppose we developed the following least squares regression equation: can we conclude? What The dependent variable increases 3.5 for each unit increase in X.! The equation crosses the Y-axis at 2.1. If X= 5, then is 14. There is a significant positive relationship between the dependent and independent variables.
Let the random variable Y represent hourly wages and the random variable X represent education. Suppose we have the following regression equation in mind to estimate the return to education: (a) Can we say that this regression would capture the causal effect of education on wages? Support your answer with reasoning. (b) Using the sample equivalent of the two equations E(u)-0 and E(uX)-0 derive the regression estimators for A, and β1-Write down each mathe tnatical step, what would be the...