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3 years ago

Which of the following statements contains an error?

1 answer:

5 0

I. is syntactically correct if genderString exists. if genderString, for example, is "Male", then char gender would be the character at index 0 (the first character), meaning 'M'.

II. is incorrect. It is using the comparison operator (==) instead of the assignment operator (=). It is also setting a boolean variable to a String value of 'F'. Boolean values cannot hold string values, and can only hold true & false.

III. is correct if ageString only contains numbers (presumably, it does, as it's called ageString). Integer.parseInt is a function that converts String values to integer values if the string values only contain numerical characters.

The answer in this case should be B. II only.

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[20 pts] Write the function rectangle(perimeter, area), which takes two positive integers, perimeter and area. It returns an int

MrRissso [65]

Hi, you haven't provided the programing language in which you need the code, I'll explain how to do it using Python, and you can follow the same logic to make a program in the programing language that you need.

Answer:

import math

def rectangle(perimeter, area):

l1_1 = (perimeter+math.sqrt((perimeter**2)-(16*area)))/4

l1_2 = (perimeter-math.sqrt((perimeter**2)-(16*area)))/4

l2_1 = area/l1_1

l2_2 = area/l1_2

print(l1_1,l2_1)

print(l1_2,l2_2)

if l1_1.is_integer() and l2_1.is_integer() and l1_1>0 and l2_1>0:

return(int(max(l1_1,l2_1)))

elif l1_2.is_integer() and l2_2.is_integer() and l1_2>0 and l2_2>0:

return(int(max(l1_2,l2_2)))

else:

return(None)

Explanation:

We import math to make basic operations
We define the rectangle function that receives perimeter and area
We calculate one of the sides (l1_1) of the rectangle using the quadratic equation to solve 2h^2 - ph + 2a = 0
We calculate the second root of the quadratic equation for the same side (l1_2)
We calculate the second side of the rectangle using the first root on w = a/h
We calculate the second side of the rectangle using the second root on w= a/h
We verify that each component of the first result (l1_1, l2_1) is an integer (using the build-in method .is_integer) and greater than 0, if True we return the maximum value between them (using the max function) as w
If the first pair of sides evaluate to False we check the second root of the equation and if they meet the specification we return the max value
if all the if statements evaluate to false we return None to indicate that not positive or integer sides were found

7 0

3 years ago

Traceroute would be best suited for which of the following tasks?

sleet_krkn [62]

The answer is A, or Locating bottlenecks in a network.

3 0

2 years ago

(20 points) Given a collection of n nuts and a collection of n bolts, arranged in an increasing order of size, give an O(n) time

Blababa [14]

Answer:

Check the explanation

Explanation:

Keep two iterators, i (for nuts array) and j (for bolts array).

while(i < n and j < n) {

if nuts[i] == bolts[j] {

We have a case where sizes match, output/return

}

else if nuts[i] < bolts[j] {

what this means is that the size of nut is lesser than that of bolt and we should go to the next bigger nut, i.e., i+=1

}

else {

what this means is that the size of bolt is lesser than that of nut and we should go to the next bigger bolt, i.e., j+=1

}

Since we go to each index in both the array only once, the algorithm take O(n) time.

6 0

3 years ago

The question is provided in the image below.

Vladimir [108]

Answer: b

Explanation:

3 0

2 years ago

A String variable, fullName, contains a name in one of two formats:last name, first name (comma followed by a blank), orfirst na

Volgvan

Answer:

#include <iostream>

using namespace std;

int main()

{

char fullname[30];

string fname="",lname="";

int i,j;

cout<<"Enter fullname\n";

cin.getline(fullname,30); //so that blank can be read

for(i=0;fullname[i]!=' ';i++)

fname+=fullname[i]; //fistname will be saved

cout<<"\n";

for(j=i;fullname[j]!='\0';j++)

lname+=fullname[j]; //lastname will be saved

cout<<"\nFirstname : "<<fname<<"\nLastname : "<<lname;

return 0;

}

OUTPUT :

Enter fullname

John thomson

Firstname : John

Lastname : thomson

Explanation:

cin.getline() should be used instead of cin in case of strings so that space can be read otherwise after blank string will be ignored.

8 0

3 years ago