Csharp/CSharp Tutorial/Operator/Remainder Operator

Determine smallest single-digit factor.

using System; 
 
class  MainClass {    
  public static void Main() {    
    int num; 
 
    for(num = 2; num < 12; num++) { 
      if((num % 2) == 0) 
        Console.WriteLine("Smallest factor of " + num + " is 2.");  
      else if((num % 3) == 0)  
        Console.WriteLine("Smallest factor of " + num + " is 3.");  
      else if((num % 5) == 0) 
        Console.WriteLine("Smallest factor of " + num + " is 5.");  
      else if((num % 7) == 0)  
        Console.WriteLine("Smallest factor of " + num + " is 7.");  
      else  
        Console.WriteLine(num + " is not divisible by 2, 3, 5, or 7.");  
    } 
  } 
}

Smallest factor of 2 is 2.
Smallest factor of 3 is 3.
Smallest factor of 4 is 2.
Smallest factor of 5 is 5.
Smallest factor of 6 is 2.
Smallest factor of 7 is 7.
Smallest factor of 8 is 2.
Smallest factor of 9 is 3.
Smallest factor of 10 is 2.
11 is not divisible by 2, 3, 5, or 7.

Use % operator to get remainder

using System; 
 
class Example {    
  public static void Main() {    
    int iresult, irem; 
    double dresult, drem; 
 
    iresult = 10 / 3; 
    irem = 10 % 3; 
 
    dresult = 10.0 / 3.0; 
    drem = 10.0 % 3.0;  
 
    Console.WriteLine("Result and remainder of 10 / 3: " + 
                       iresult + " " + irem); 
    Console.WriteLine("Result and remainder of 10.0 / 3.0: " + 
                       dresult + " " + drem); 
  }    
}

Result and remainder of 10 / 3: 3 1
Result and remainder of 10.0 / 3.0: 3.33333333333333 1