Question

In C++

Do not use a compiler like CodeBlocks or online. Trace the code by hand.

Do not write "#include" and do not write whole "main()" function. Write only the minimal necessary code to accomplish the required task.

                                                                                                         

Save your answer file with the name: "FinalA.txt"

1) (2 pts) Given this loop                                                                                         

    int cnt = 1;

    do {

    cnt += 3;

    } while (cnt < 25);

    cout << cnt;

It runs ________ times

    After the loop, code will print the number _______

2) (2 pts) Given this loop                                                                                         

    int cnt = 10, i = 0;

    while (cnt < 11 || i > 0) {

                i += 1;

    } ;

    It runs ________ times

3) (2 pts) Given this loop                                                                          

    for (int k = 0 ; k > 20 ; k++) {

                cout << "Hello";

    }

    It runs ________ times

4) (2 pts) Given this loop                                                                                          

    int k = 0;

    for ( ; ; ++k) {

                if (k == 30) break;

    }

    It runs ________ times

5) (2 pts)Given this code                                                                                        

         string name;

         cout << "Enter a name: ";

         cin >> name;

Write one line of code to print the last character of the name:

_______________________

  

6) (4 pts)Given this code                                                                                        

string s;

cout << "Enter a string:";

cin >> s;

//To do

Write the code to find if the character 'A' is present in the input string. If it is present, print the position number of the first occurrence of 'A'; the printed position of the first character is 1.

__________________

7) (5 pts) Write the code to create an integer array that contains all the numbers that are divisible by 2 in the range from 1 to 1000.                                                                                       

_______________

8) (5 pts) Complete this function that calculates the N-powers of the numbers in an array "numbers" and put the results in the same numbers array. N is given as the exponent parameter. Function returns the sum of all the results. Assume that "cmath" is already included. Use only one loop in the function

In main()

This is given to you as a sample, do not write it:

double arr [5] = { 1.2, 3.4 , 5.6, 12.8, 1.7 };

double result = getPowers(arr, 3, 5); // result contains the sum of the result array

// arr array will contain the cubic powers (power 3) of the numbers

Function definition:

double getPowers(double numbers[ ], int exponent, int size) {

// fill out the code

……………..

}

9) (5 pts) Complete the following function that takes 3 arguments of a circle :

- radius (input argument)

- area (output argument, to be calculated)

- circumference (output argument, to be calculated)

All arguments are double type.

If a radius is negative, the function returns false, otherwise it returns true.

The function does only calculation, and does nothing else.

Assume that all #include are already there                                    

// Fill in your Function prototype

bool circleAreaAndCircumference ( _______, ________, __________);

int main() {

         double radius, area, circumference;

         cout << "Enter a circle radius:";

         cin >> radius;

         bool res =____________________ // call the function

         if (res)

    cout << "Area is " << area << endl << "Circumference is " << circumference << endl;

         else

    cout << "Invalid circle";

}

// Fill in your full function definition

//................

//

10) (4 pts) Given the following code

int num[30] = {2, 4, 6, 9, 5, -1, 7, 10};

Do not write any code.

Show the value of:

a. num[3] + num[4]

b. num[6]

c. num[9] + 1

d. num[30]

        

11) (6 pts) Suppose we want to have an array of 16 hexadecimal digits from '0', .....,'9', 'A',....'F'. Use one or two loops to fill data in the array. Fill in the ___ portion below:                                                                    

       char digits [ ___ ];   

// Write your loop and other code

    ......

      

12) (6 pts) Write a function to count the number of occurrences of a specific decimal digit in a string

// Function prototype     

int countDigit(int digit, string str) ;

For example, this function can be called like this:

int main() {

    string str = "12314561asd vd&*1";

    int digit = 1;

    int cnt = countDigit(1, str);

    // Expected output : Number of 1 in the string is 4

    cout << "Count of digit " << digit << " in the string is " << cnt;

}

13) (5 pts) Create 2 parallel arrays:

-one array contains the names of the 12 months.

-one array contains the number of days in each month. Assume that it is not a leap year.

Then write a loop using the above 2 arrays to display the names and numbers of days in each month that has the format like this:

MM has DD days

January has 31 days

February has 28 days

_______

14) (5 pts) Write one single function that can multiply either 2, 3, or 4 numbers and returns the product

double res1 = multiply(1.2, 3.4);

double res2 = multiply(1.2, 3.4, 5.8);

double res3 = multiply(1.2, 3.4, 5.8, 4.7);

15) (5 pts) Write the code to create a vector named 'letters' of char type. Then use a loop to add 26 characters of the alphabet in uppercase 'A' through 'Z' to the vector.

Answer 1

1. It will run 8 times and it will print 25

• Do loop run and after running the condition is checked.
• For the first time, cnt=1 and after going to the loop it will increment the cnt value by 3, so cnt becomes 4.
• Similarly for the second, third, fourth.. till the eight iterations, every time cnt will be incremented by 3 and the value will reach 25.
• In Eight iteration, when the cnt becomes 25, the while loop will match the cnt value and since it is 25, it will exit.
• So, the loop runs 8 times and cnt =25

2. It will run infinite times.

• A||B will check if any of the value is true, then the result will be true.
• In this case, cnt=10 that is always less than 11, so the loop will run infinitely since the condition written in while will always execute.

3. It will run 0 times

• In FOR loop, first, the initialization happens and then the condition is checked and if the condition is met, then the loop is executed and the variable is incremented.
• In this k=0 will take place and then the condition is checked. Since k is less than 20, the test condition will never meet and the loop will never execute.

4. It will run 31 times.

• In this case, initialization of k happens at the starting and termination condition is written inside a block.
• So, for loop will execute for k=1 and check for the termination condition and since k is not equal to 30, the increment of k will take place and k will become 2 and the loop will execute.
• In this way, the loop will execute till 30 and after k becomes 30, k will be incremented and since k=30, the loop will break.
• So, 31st iteration is just checking the value of k and breaking out of the loop.

Friend, this was a really nice question to answer. As per the Chegg policy, I am obliged to answer the first four questions. If you find my answer helpful, please like it. Thanks.