Grade-9 Winter Vacation Homework 2081

Home

10 questions about conditional statements in QBasic, covering IF, IF...ELSE, IF...ELSEIF...ELSE, and SELECT CASE:

---

Questions on IF:

1. Write a QBasic program using an IF statement to check if a number entered by the user is positive.
2. Create a program to check if a number is divisible by 5 using a single IF statement.

---

Questions on IF...ELSE:

3. Write a program using IF...ELSE to determine if a number entered by the user is even or odd.
4. Write a QBasic program using IF...ELSE to print "Adult" if the user's age is 18 or above, and "Minor" otherwise.

---

Questions on IF...ELSEIF...ELSE:

5. Write a QBasic program to grade a student's marks:
   • 90 and above: "A"
   • 80-89: "B"
   • 70-79: "C"
   • Below 70: "Fail"
6. Create a QBasic program that uses IF...ELSEIF...ELSE to classify a person's Body Mass Index (BMI):
   • BMI < 18.5: "Underweight"
   • 18.5 <= BMI < 25: "Normal weight"
   • 25 <= BMI < 30: "Overweight"
   • BMI >= 30: "Obese"

---

Questions on SELECT CASE:

7. Write a program using SELECT CASE to display the name of the day based on a number entered by the user (1 for Monday, 2 for Tuesday, ..., 7 for Sunday).
8. Write a QBasic program using SELECT CASE to display the category of a vehicle based on the number of wheels entered by the user:
   • 2 wheels: "Bike"
   • 4 wheels: "Car"
   • More than 4 wheels: "Truck"
   • Otherwise: "Unknown"

---

Mixed Questions:

9. Write a program that asks the user to enter a character and checks if it is a vowel (a, e, i, o, u) or a consonant using IF...ELSEIF...ELSE.
10. Create a QBasic program using SELECT CASE to calculate a discount based on the purchase amount:

• Purchase >= 500: 20% discount
• Purchase between 200 and 499: 10% discount
• Purchase < 200: No discount

---

10 QBasic questions involving loops, covering FOR, WHILE, DO...WHILE, DO LOOP WHILE, DO UNTIL, and DO LOOP UNTIL:

---

Questions on FOR:

1. Write a QBasic program using a FOR loop to print the first 10 natural numbers.
2. Create a program using a FOR loop to calculate the sum of all even numbers between 1 and 50.

---

Questions on WHILE:

3. Write a QBasic program using a WHILE loop to find the factorial of a number entered by the user.
4. Use a WHILE loop to print all multiples of 3 between 1 and 30.

---

Questions on DO WHILE:

5. Write a QBasic program using a DO WHILE loop to print the squares of numbers from 1 to 10.
6. Create a program using a DO WHILE loop that asks the user to enter numbers until they enter a negative number, then display the sum of all entered numbers.

---

Questions on DO LOOP WHILE:

7. Write a QBasic program using a DO LOOP WHILE to reverse a number entered by the user (e.g., input: 1234, output: 4321).
8. Use a DO LOOP WHILE to display the first 10 terms of the Fibonacci series.

---

Questions on DO UNTIL:

9. Write a QBasic program using DO UNTIL to display all odd numbers between 1 and 20.
10. Create a program using DO UNTIL to count the number of digits in a number entered by the user.

---

Bonus Question:

Write a program using DO LOOP UNTIL that calculates the sum of numbers entered by the user, stopping when the user enters zero, and displays the total sum.

---

10 QBasic questions that involve using inbuilt library functions like LEFT$, RIGHT$, MID$, VAL, STR$, UCASE$, and LCASE$, including practical applications such as checking for palindromes, counting vowels and consonants, and integer-to-binary conversion:

---

Questions on String Manipulation (LEFT$, RIGHT$, MID$):

1. Write a QBasic program to extract and display the first 3 characters of a string entered by the user using the LEFT$ function.
2. Create a program to display the last 4 characters of a string entered by the user using the RIGHT$ function.
3. Write a QBasic program that uses the MID$ function to extract a substring from the 3rd to the 6th character of a string entered by the user.

---

Questions on Conversion Functions (VAL, STR$):

4. Write a program to convert a numeric string (e.g., "1234") into a number using VAL, add 10 to it, and display the result.
5. Create a QBasic program to convert an integer entered by the user into a string using STR$, concatenate it with another string (e.g., " is the number"), and display the result.

---

Questions on Case Conversion (UCASE$, LCASE$):

6. Write a program that converts a string entered by the user to uppercase using UCASE$.
7. Create a QBasic program that converts a string entered by the user to lowercase using LCASE$.

---

Practical Applications:

8. Check Palindrome: Write a QBasic program to check if a string entered by the user is a palindrome (e.g., "madam" is a palindrome). Use MID$, LEFT$, and RIGHT$.
9. Count Vowels and Consonants: Write a program to count the number of vowels and consonants in a string entered by the user using MID$ and UCASE$ (to handle case insensitivity).
10. Integer to Binary Conversion: Write a QBasic program to convert an integer entered by the user into its binary representation. Use a loop and string concatenation with STR$ to build the binary string.

---

Example Scenarios:

• For the palindrome check, reverse the string using MID$ or RIGHT$ and compare it with the original string.
• For the vowels and consonants count, use MID$ to extract characters one by one, UCASE$ to standardize the case, and conditional checks (IF) to categorize each character.
• For integer-to-binary conversion, use repeated division by 2, store remainders as strings using STR$, and reverse the binary string at the end using RIGHT$.

These questions provide a mix of theoretical understanding and practical problem-solving with QBasic's inbuilt functions.