C# Program to Print Multiplication Table

You can print a multiplication table in C# using a for loop like this: for (int i = 1; i <= 10; i++) { Console.WriteLine($"{number} x {i} = {number * i}"); } where number is the base number for the table.

Examples

Inputnumber = 2

Output2 x 1 = 2 2 x 2 = 4 2 x 3 = 6 2 x 4 = 8 2 x 5 = 10 2 x 6 = 12 2 x 7 = 14 2 x 8 = 16 2 x 9 = 18 2 x 10 = 20

Inputnumber = 5

Output5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40 5 x 9 = 45 5 x 10 = 50

Inputnumber = 0

Output0 x 1 = 0 0 x 2 = 0 0 x 3 = 0 0 x 4 = 0 0 x 5 = 0 0 x 6 = 0 0 x 7 = 0 0 x 8 = 0 0 x 9 = 0 0 x 10 = 0

How to Think About It

To print a multiplication table, think of counting from 1 to 10 and multiplying each count by the chosen number. For each step, you show the multiplication expression and its result. This repeats until you reach 10.

Algorithm

1

Get the number for which to print the multiplication table

2

Start a loop from 1 to 10

3

Multiply the number by the current loop count

4

Print the multiplication expression and result

5

Repeat until the loop reaches 10

Code

csharp

using System;
class Program {
    static void Main() {
        int number = 7;
        for (int i = 1; i <= 10; i++) {
            Console.WriteLine($"{number} x {i} = {number * i}");
        }
    }
}

Output

7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70

Dry Run

Let's trace the multiplication table for number 3 through the code

1

Set number

number = 3

2

Start loop

i = 1

3

Calculate and print

3 x 1 = 3

4

Increment loop

i = 2

5

Calculate and print

3 x 2 = 6

i	Output
1	3 x 1 = 3
2	3 x 2 = 6
3	3 x 3 = 9
4	3 x 4 = 12
5	3 x 5 = 15
6	3 x 6 = 18
7	3 x 7 = 21
8	3 x 8 = 24
9	3 x 9 = 27
10	3 x 10 = 30

Why This Works

Step 1: Loop from 1 to 10

The for loop runs 10 times, once for each multiplier from 1 to 10.

Step 2: Multiply and print

Inside the loop, the program multiplies the base number by the current loop index and prints the result.

Step 3: Use string interpolation

The $"{number} x {i} = {number * i}" syntax creates a readable output showing the multiplication expression and result.

Alternative Approaches

Using while loop

csharp

using System;
class Program {
    static void Main() {
        int number = 4;
        int i = 1;
        while (i <= 10) {
            Console.WriteLine($"{number} x {i} = {number * i}");
            i++;
        }
    }
}

This uses a <code>while</code> loop instead of <code>for</code>, which is more flexible but slightly longer.

User input for number

csharp

using System;
class Program {
    static void Main() {
        Console.Write("Enter a number: ");
        int number = int.Parse(Console.ReadLine());
        for (int i = 1; i <= 10; i++) {
            Console.WriteLine($"{number} x {i} = {number * i}");
        }
    }
}

This version asks the user to enter the number, making the program interactive.

Complexity: O(1) time, O(1) space

Time Complexity

The loop runs exactly 10 times, so the time is constant, O(1), regardless of the input number.

Space Complexity

The program uses a fixed amount of memory for variables and output, so space complexity is O(1).

Which Approach is Fastest?

All approaches run in constant time; differences are mainly in code style and user interaction.

Approach	Time	Space	Best For
For loop	O(1)	O(1)	Simple, clear fixed-length loops
While loop	O(1)	O(1)	Flexible loop conditions
User input	O(1)	O(1)	Interactive programs