Question

Checkpoint 8.1

Assume the variable name references a string. Write a for loop that prints each character letter in the string. The actual print statement is provided.

# What goes here?
print(letter)

Checkpoint 8.11

Write an if statement using the in operator that determines whether 'd' is in my_string. A print statement that might be placed after the if statement is included.

# What goes here?
print('Yes, it is there.')

Checkpoint 8.13

Write the first if statement to complete the code below. The block should display “Digit” if the string referenced by the variable ch contains a numeric digit. Otherwise, it should display “No digit.”

# What goes here?
⋅⋅⋅⋅print('Digit')
else:
⋅⋅⋅⋅print('No digit')

(Note: The ⋅⋅⋅⋅ symbols represent indentation.)

Checkpoint 8.15

The code below asks the user “Do you want to repeat the program or quit? (R/Q)”. A loop should repeat until the user has entered an R or Q (either uppercase or lowercase). Replace the second line with the appropriate while statement.

again = input('Do you want to repeat ' +
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅'the program or quit? (R/Q) ')
# What goes here?
⋅⋅⋅⋅again = input('Do you want to repeat the ' +
⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅'program or quit? (R/Q) ')

(Note: The ⋅⋅⋅⋅ symbols represent indentation.)

Checkpoint 8.17

A loop counts the number of uppercase characters that appear in the string referenced by the variable mystring. Replace the second statement with the appropriate if statement.

for letter in mystring:
⋅⋅⋅⋅# What goes here?
⋅⋅⋅⋅count += 1

(Note: The ⋅⋅⋅⋅ symbols represent indentation.)

Checkpoint 8.18

Assume the following statement appears in a program:
days = 'Monday Tuesday Wednesday'

Write a statement that splits the string, creating the following list named my_list:
['Monday', 'Tuesday', 'Wednesday']

Checkpoint 8.19

Assume the following statement appears in a program:
values = 'one$two$three$four'

Write a statement that splits the string, creating the following list named my_list:
['one', 'two', 'three', 'four']

Answer 1

Hello, The question has not specified any language so I am answering in java. I have added COMMENTS and the SAMPLE OUTPUT for each answer . Please find the answer attached below.

ANSWER FOR CHECKPOINT 8.1 -->

// ANSWER FOR CHECKPOINT 8.1

import java.io.*;
import java.util.*;

public class StringLetters{

     public static void main(String []args){
        String String1 = new String("ABCDEF" ); //this is the string 
        System.out.print("The String is : " );
        System.out.println(String1);       // display the string to user 
        
        int a=String1.length(); //finding the length of the string
        System.out.print("The letters in the string are:" );
        for(int i=0;i<a;i++)
        {   
            System.out.print(String1.charAt(i)+ " ");  //print each character/letter of the string 
        }
      
     }
}
/* ------------- SAMPLE OUTPUT -----------------
The String is : ABCDEF
The letters in the string are:A B C D E F 

---------------------------------------------*/

ANSWER FOR CHECKPOINT 8.11 -->

//ANSWER FOR CHECKPOINT 8.11-->
import java.io.*;
import java.util.*;

public class StringLetters{

     public static void main(String []args){
        String String1 = new String("document" ); //this is the string 
        System.out.print("The String is : " );  // display the string to the user 
        System.out.println(String1);
        int ret=String1.indexOf('d'); //The string.indexOf returns -1 if d is not present in the string 
        if (ret== -1)        // if d is not present ret will be -1 
        System.out.print("Its not there");  //if d not present show message 
        else 
        System.out.print("Yes, it is there"); // if "d" is present show the message 
        
        }
      
     }

/* ------------- SAMPLE OUTPUT -----------------

The String is : document
Yes, it is there

---------------------------------------------*/

ANSWER FOR CHECKPOINT 8.13 -->

//ANSWER FOR CHECKPOINT 8.13-->
import java.io.*;
import java.util.*;

public class StringLetters{

     public static void main(String []args){
        String String1 = "doc5"; //this is the string 
        boolean digit = false;  // this is boolean variable to store state 
        char[] chars = String1.toCharArray(); //converting string to char array for operation on characters
       
        for(char c : chars){ 
         if(digit=Character.isDigit(c)){  //checking if any character is digit this will store true in digit if a digit is present in the character array of string
             break;
            }
        }
        if(digit==true)  // if digit is found print digit 
          System.out.println("digit");
        else 
        System.out.println("no digit"); // if not found no digit is printed 
   
     }
}
/* ------------- SAMPLE OUTPUT -----------------

digit
//because digit "5" is present in the string 
---------------------------------------------*/

ANSWER FOR CHECKPOINT 8.15-->

//ANSWER FOR CHECKPOINT 8.15-->

import java.util.*;

public class StringLetters{

     public static void main(String []args){
        Scanner sc=new Scanner(System.in);
        while(1){  // This is the loop as asked in the question
        System.out.println("Do you want to repeat the program or quit? (R/Q)");  //displaying the options 
        char ch; //this is the character to store user input 
        ch = sc.next().charAt(0);  // reading the input 
        
        System.out.println("your input is :"); 
        System.out.println(ch); //display the input character to user
        switch(ch){
            case 'r':main(); //any other function can also be called 
                    break;
            case 'q': System.exit(0); //succesfully terminate the program or exit the program
                    break;
            } 
   }
}
}
/* ------------- SAMPLE OUTPUT -----------------
if r is given as input main is called again 
and options are displayed

if q is given then program will terminate.
---------------------------------------------*/

THANK YOU !!