15 Simple C# Exercises with Answers
These are beginner-level exercises, suitable for practicing variables, input/output, operators, conditions, and loops.
1. Print Your Name
Question: Write a C# program to print your name.
Answer:
Console.WriteLine("Benazir");2. Read and Display a Name
Question: Get a name from the user and display it.
Answer:
Console.Write("Enter your name: ");
string name = Console.ReadLine();
Console.WriteLine("Hello " + name);3. Add Two Numbers
Question: Get two numbers from the user and display their sum.
Answer:
Console.Write("Enter first number: ");
int a = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter second number: ");
int b = Convert.ToInt32(Console.ReadLine());
int sum = a + b;
Console.WriteLine("Sum = " + sum);4. Perform Basic Arithmetic Operations
Question: Get two numbers and display addition, subtraction, multiplication, and division.
Answer:
int a = 20;
int b = 5;
Console.WriteLine("Addition = " + (a + b));
Console.WriteLine("Subtraction = " + (a - b));
Console.WriteLine("Multiplication = " + (a * b));
Console.WriteLine("Division = " + (a / b));5. Find Even or Odd
Question: Check whether a number is even or odd.
Answer:
Console.Write("Enter a number: ");
int number = Convert.ToInt32(Console.ReadLine());
if (number % 2 == 0)
{
Console.WriteLine("Even Number");
}
else
{
Console.WriteLine("Odd Number");
}6. Find Positive, Negative, or Zero
Question: Check whether a number is positive, negative, or zero.
Answer:
Console.Write("Enter a number: ");
int number = Convert.ToInt32(Console.ReadLine());
if (number > 0)
{
Console.WriteLine("Positive");
}
else if (number < 0)
{
Console.WriteLine("Negative");
}
else
{
Console.WriteLine("Zero");
}7. Find the Largest of Two Numbers
Question: Get two numbers and display the largest.
Answer:
int a = 10;
int b = 20;
if (a > b)
{
Console.WriteLine(a + " is largest");
}
else
{
Console.WriteLine(b + " is largest");
}8. Find the Largest of Three Numbers
Question: Find the largest among three numbers.
Answer:
int a = 10;
int b = 30;
int c = 20;
if (a >= b && a >= c)
{
Console.WriteLine(a + " is largest");
}
else if (b >= a && b >= c)
{
Console.WriteLine(b + " is largest");
}
else
{
Console.WriteLine(c + " is largest");
}9. Check Voting Eligibility
Question: Get the user's age and check whether they are eligible to vote.
Answer:
Console.Write("Enter your age: ");
int age = Convert.ToInt32(Console.ReadLine());
if (age >= 18)
{
Console.WriteLine("Eligible to vote");
}
else
{
Console.WriteLine("Not eligible to vote");
}10. Print Numbers from 1 to 10
Question: Use a for loop to print numbers from 1 to 10.
Answer:
for (int i = 1; i <= 10; i++)
{
Console.WriteLine(i);
}11. Print Even Numbers from 1 to 20
Question: Display all even numbers between 1 and 20.
Answer:
for (int i = 1; i <= 20; i++)
{
if (i % 2 == 0)
{
Console.WriteLine(i);
}
}12. Find the Sum from 1 to 10
Question: Calculate the sum of numbers from 1 to 10.
Answer:
int sum = 0;
for (int i = 1; i <= 10; i++)
{
sum = sum + i;
}
Console.WriteLine("Sum = " + sum);Output:
Sum = 5513. Print a Multiplication Table
Question: Get a number and print its multiplication table.
Answer:
Console.Write("Enter a number: ");
int number = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= 10; i++)
{
Console.WriteLine(number + " x " + i + " = " + (number * i));
}For input 5:
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
...
5 x 10 = 5014. Calculate Simple Interest
Question: Calculate simple interest using:
Simple Interest = (Principal × Rate × Time) / 100
Answer:
double principal = 10000;
double rate = 5;
double time = 2;
double interest = (principal * rate * time) / 100;
Console.WriteLine("Simple Interest = " + interest);Output:
Simple Interest = 100015. Simple Grade Calculator
Question: Get a student's mark and display the grade.
- 90–100 → A
- 80–89 → B
- 70–79 → C
- 60–69 → D
- Below 60 → Fail
Answer:
Console.Write("Enter your mark: ");
int mark = Convert.ToInt32(Console.ReadLine());
if (mark >= 90)
{
Console.WriteLine("Grade A");
}
else if (mark >= 80)
{
Console.WriteLine("Grade B");
}
else if (mark >= 70)
{
Console.WriteLine("Grade C");
}
else if (mark >= 60)
{
Console.WriteLine("Grade D");
}
else
{
Console.WriteLine("Fail");
}These 15 exercises cover the main C# beginner fundamentals: Console.WriteLine, Console.ReadLine, variables, data types, arithmetic operators, %, if/else, logical operators, and for loops.