In Vista and Windows 7, the Appearance and Personalization option allows you to change the

Write a C program that reads two hexadecimal values from the keyboard and then stores the two values into two variables of type

sattari [20]

Solution :

#include $$$$

//Converts $\text{hex string}$ to binary string.

$\text{char}$ * hexadecimal $\text{To}$ Binary(char* hexdec)

{

long $\text{int i}$ = 0;

char *string = $(\text{char}^ *) \ \text{malloc}$ (sizeof(char) * 9);

while (hexdec[i]) {

//Simply assign binary string for each hex char.

switch (hexdec[i]) {

$\text{case '0'}:$

strcat(string, "0000");

break;

$\text{case '1'}:$

strcat(string, "0001");

break;

$\text{case '2'}:$

strcat(string, "0010");

break;

$\text{case '3'}:$

strcat(string, "0011");

break;

$\text{case '4'}:$

strcat(string, "0100");

break;

$\text{case '5'}:$

strcat(string, "0101");

break;

$\text{case '6'}:$

strcat(string, "0110");

break;

$\text{case '7'}:$

strcat(string, "0111");

break;

$\text{case '8'}:$

strcat(string, "1000");

break;

$\text{case '9'}:$

strcat(string, "1001");

break;

case 'A':

case 'a':

strcat(string, "1010");

break;

case 'B':

case 'b':

strcat(string, "1011");

break;

case 'C':

case 'c':

strcat(string, "1100");

break;

case 'D':

case 'd':

strcat(string, "1101");

break;

case 'E':

case 'e':

strcat(string, "1110");

break;

case 'F':

case 'f':

strcat(string, "1111");

break;

default:

printf("\nInvalid hexadecimal digit %c",

hexdec[i]);

string="-1" ;

}

i++;

}

return string;

}

int main()

{ //Take 2 strings

char *str1 =hexadecimalToBinary("FA") ;

char *str2 =hexadecimalToBinary("12") ;

//Input 2 numbers p and n.

int p,n;

scanf("%d",&p);

scanf("%d",&n);

//keep j as length of str2

int j=strlen(str2),i;

//Now replace n digits after p of str1

for(i=0;i<n;i++){

str1[p+i]=str2[j-1-i];

}

//Now, i have used c library strtol

long ans = strtol(str1, NULL, 2);

//print result.

printf("%lx",ans);

return 0;

}

4 0

3 years ago

William would like to sort a list of items after the data is already entered.

harkovskaia [24]

The symbol method is not an available sort option.

8 0

3 years ago

A security utility program that scans the system for small programs that interfere with how a computer functions are _____ utili

Aneli [31]

Answer:

A security utility program that scans the system for small programs that interfere with how a computer functions are _____ utilities.

Explanation:

7 0

3 years ago

Observing users as they enter passwords or other personal information to a computer Auditing software often used to test compute

GuDViN [60]

Answer:

Explanation:

1. Observing users as they enter passwords or other personal information to a computer Auditing software often used to test computer data - (shoulder surfing)

2. An acronym for security institute that studies computer crime activities The act of altering data that are entered into, or used by, a computer --- (CSI)

3. A small text file that stores information about your browsing habits and interests Stealing personal information from trash cans - (COOKIES)

4. A software program specifically designed for computer forensic investigations - (EnCase)

5. A type of fraud in which the perpetrator steals small amounts from many different accounts - (salami technique)

6. A software program or hardware device designed to prevent unauthorized data communications - (firewall)

7. Malicious software similar to a computer virus -- (_worm)

8. Federal legislation aimed specifically at computer crime (CFAA)

8 0

3 years ago

Write a program consisting of: a. A function named right Triangle() that accepts the lengths of two sides of a right triangle as

Lunna [17]

Answer:

The java program is as follows.

import java.lang.*;

public class Triangle

{

//variables to hold sides of a triangle

static double height;

static double base;

static double hypo;

//method to compute hypotenuse

static double rightTriangle(double h, double b)

{

return Math.sqrt(h*h + b*b);

}

public static void main(String[] args) {

height = 4;

base = 3;

hypo = rightTriangle(height, base);

System.out.printf("The hypotenuse of the right-angled triangle is %.4f", hypo);

}

OUTPUT

The hypotenuse of the right-angled triangle is 5.0000

Explanation:

1. The variables to hold all the three sides of a triangle are declared as double. The variables are declared at class level and hence, declared with keyword static.

2. The method, rightTriangle() takes the height and base of a triangle and computes and returns the value of the hypotenuse. The square root of the sum of both the sides is obtained using Math.sqrt() method.

3. The method, rightTriangle(), is also declared static since it is called inside the main() method which is a static method.

4. Inside main(), the method, rightTriangle() is called and takes the height and base variables are parameters. These variables are initialized inside main().

5. The value returned by the method, rightTriangle(), is assigned to the variable, hypo.

6. The value of the hypotenuse of the triangle which is stored in the variable, hypo, is displayed to the user.

7. The value of the hypotenuse is displayed with 4 decimal places which is done using printf() method and %.4f format specifier. The number 4 can be changed to any number, depending upon the decimal places required.

8. In java, all the code is written inside a class.

9. The name of the program is same as the name of the class having the main() method.

10. The class having the main() method is declared public.

11. All the variables declared outside main() and inside another method, are local to that particular method. While the variables declared outside main() and inside class are always declared static in java.

4 0

3 years ago