Question

##4. What will the following program display?

##def main():

## x = 1

## y = 3.4

## print(x, y) ## first printing

## change_us(x, y)

## print(x, y) ##second printing

##

##def change_us(a, b):

## a = 0

## b = 0

## print(a, b)

##

##main()

##

##Yes, yes, main() displays

##1 3.4

##0 0

##1 3.4

## The question is: why x and y are still the same while the second printing of

(x,y)?

## It seems that both x and y went through change_us() subprogram and change_us()

## makes zeros from its arguments?

##Explain, please.

##5. Look at the following function definition:

##def my_function(a, b, c):

## return a + (b - c)

##a. Write a statement that calls this function and uses keyword arguments

##to pass 2 into b and 3 into c.

##b. What will be printed when the function call my_function(3.5) executes?

##6. Write a statement that generates a random number in the range of 1 through 100

and

##assigns it to a variable named rand.

##Solution:

##import random

##rand = random.randint(1, 100)

##6.1 further exension.

## a) Write a function RANDO(n) which returns a raw of n(independent)

##random numbers from 1 to 100. Use random.seed(10).

##Let n is always to be integer and > 1 (don't check that)

## hint:

##def random_raw(n):

## import random

## random.seed(10)

## for m in .......:

## print(random.randint(1, 100), ....)

## b) Call your function for n=3

##7. The following statement calls a function named half, which returns a value

##that is half that of the argument. (Assume the number variable references a float

value.)

##Write code for the function.

##result = half(number)

##Solution:

##def half(value):

## return value / 2.0

##7.1 Further extension. Write a program value_part() which returns the

##pth part (as float) of the value (value and p are integer).

##Let get value and p as input. Format the result as .2f.

##Hint:

##def value_part():

## value = int(input('put the value: '))

## p = ...(...('put the p: '))

## return ...(.../..., '.2f')

Answer 1

4

x and y are still the same while the second printing of (x,Y) because both x and y are declared inside the main method and

we are printing x and y inside the main only .and when we call change_us method then the value of a=x=1 and b=y=3.4

but in change_us method we modify a and b that a=0 b=0 so print(a,b) after change of a and b will print 0 0

here no modification is done regarding to the variable x and y so it will remain same as previous value .

so the output

1 3.4

0 0

1 3.4

5.

x=my_function(1,2,3)

here value of a=1,b=2 and c=3 the return value is stored in x

b) compilation error

6