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C++ Coding Exercises


Practice C++ programming with coding exercises covering variables, data types, operators, input and output, type casting, conditional statements, loops, functions, arrays, and other C++ fundamentals.

1. C++ Basics

Problem Statement 1: const and #define

Write a C++ program to demonstrate the use of const and #define for defining constant values.

The program should:

  1. Define the value of PI using #define.
  2. Declare a constant integer DAYS_IN_WEEK using const and assign it the value 7.
  3. Display the values of PI and DAYS_IN_WEEK.
  4. Declare a floating-point variable radius and assign it the value 5.0.
  5. Calculate the area of a circle using PI and radius.
  6. Display the radius and calculated area.
  7. Include a commented example showing that a const variable cannot be changed after initialization.

Expected Output:

Value of PI using #define: 3.14159
Days in a week using const: 7
Area of circle with radius 5 is: 78.5397

Problem Statement 2: Explicit Type Casting

Write a C++ program that:

  1. Declares two integer variables a = 5 and b = 2.
  2. Declares a third variable c of type float.
  3. Uses explicit type casting to convert one of the integer variables to float before performing the division.
  4. Stores the division result in variable c.
  5. Displays the value of c.

Expected Output

2.5

2. Input and Output

Problem Statement 1: – Student Information

Write a C++ program that takes the student’s name, age, and marks as input and displays them using cout.

Problem Statement 2: – Calculate Total

Write a C++ program that takes the prices of three items from the user, calculates the total, and displays the result.

Problem Statement 3: – Calculate Rectangle Perimeter

Write a C++ program that takes the length and width of a rectangle and calculates:

Perimeter = 2 × (Length + Width)

Display the result using cout.

Problem Statement 4: – Calculate Average

Write a C++ program that takes marks of three subjects, calculates the average, and displays the result.

Problem Statement 5: – Student Age

Write a C++ program that asks the user to enter their age and displays:

Your age is: 20

Problem Statement 6: – Two Numbers

Write a C++ program that takes two integers from the user and displays their:

  • Sum
  • Difference
  • Product

Problem Statement 7: – Student Marks

Write a C++ program that takes marks of three subjects and displays the total marks.

Problem Statement 8: – Rectangle

Write a C++ program that takes the length and width of a rectangle and calculates its area.

Formula:

Area = Length × Width

Problem Statement 9: – Student Information

Write a C++ program that takes the following information from the user:

  • Name
  • Age
  • Department
  • Marks

Then display all the information using cout.

Problem Statement 10: – endl

Write a C++ program that displays your:

  • Name
  • Department
  • Semester

Use endl to print each item on a separate line.

Problem Statement 11: – setw

Write a C++ program to display the following table using setw(10):

Number    Cube
2         8
3         27
4         64
5         125

Problem Statement 12: – Both Manipulators

Write a C++ program that uses both endl and setw() to display a simple student information table containing:

  • Roll No.
  • Name
  • Marks

3. Conditional Statements

Problem Statement 1: Positive, Negative or Zero - if statement

Write a C++ program that takes a number as input and checks whether it is positive, negative, or zero. Display the appropriate message based on the entered number.

Hint: Use an if-else-if ladder.

Problem Statement 2: Check Even or Odd - if statement

Write a C++ program that takes an integer as input and determines whether it is even or odd. Display an appropriate message based on the result.

Hint: Use the modulus operator (%) to check the remainder when the number is divided by 2.

Problem Statement 3: Check Eligibility Based on Marks - if statement

Write a C++ program that takes a student’s marks as input. If the marks are 50 or above, display “Eligible”; otherwise, display “Not Eligible”.

Hint: Use an if-else statement to check the marks.

Problem Statement 4: Student Grade Calculator - if statement

Write a C++ program that takes a student’s marks as input and displays the corresponding grade according to the following criteria:

  • A: 80–100 marks
  • B: 70–79 marks
  • C: 60–69 marks
  • D: 50–59 marks
  • Fail: Below 50 marks

If the entered marks are less than 0 or greater than 100, display “Invalid Marks”.

Hint: Use an if-else-if ladder to check the marks and assign the appropriate grade. First, validate that the marks are between 0 and 100.

Problem Statement 5: Find the Larger Number - if statement

Write a C++ program that takes two numbers as input and compares them. Display the larger number. If both numbers are equal, display “Both numbers are equal.”

Hint: Use an if-else-if ladder to compare the two numbers and handle all three possible cases.

Problem Statement 6: Login Authentication System - if statement

Write a C++ program that takes two inputs: a user verification flag and a password verification flag. Display “Login Successful” only if both flags indicate that the username and password are correct. Otherwise, display “Login Failed”.

Hint: Use nested if statements to check the user verification flag first and then the password verification flag.

Problem Statement 7: Scholarship Eligibility Checker - if statement

Write a C++ program that takes a student’s marks and family monthly income as input. The student is eligible for a scholarship only if both of the following conditions are met:

  • The student’s marks are 80 or above.
  • The family’s monthly income is below Rs. 60,000.

Display “Scholarship Awarded” if the student meets both conditions. Otherwise, display “Not Eligible for Scholarship”.

Hint: Use nested if statements to check the marks first and then the family income.

Course Registration

Problem Statement 8: Student Registration Eligibility - if statement

Write a C++ program that takes three inputs to check whether a student can register:

  • Admission Status: Admission is confirmed.
  • Fee Status: Required fee has been paid.
  • Document Verification Status: All required documents have been verified.

Display “Registration Allowed” only if all three requirements are satisfied. Otherwise, display “Registration Not Allowed”.

Hint: Use nested if statements with appropriate else branches to check each requirement one by one.