C# Program to find Number Combination
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Find Number Combination
In the following example, we will find all possible combinations of numbers with 4 and 8 within the limit 500.
Example
C# Compiler
using System;
namespace myApp
{
class Program
{
static void Main(string[] args)
{
int combination = 2;
int[] num = {4, 8};
int limit = 500;
int i, j, lastDigit, copyNum, digit, count;
Console.WriteLine("List of combinations of 4 and 8 upto 500: ");
// Iterate from 1 to limit
for(i=1; i<=limit; i++)
{
copyNum = i;
count = 0;
digit = 0;
// Check each digit starting from last digit
while(copyNum != 0)
{
count++;
lastDigit = copyNum % 10;
for(j=0; j<combination; j++)
{
if(num[j] == lastDigit)
digit++;
}
copyNum = copyNum / 10;
}
// result
if(count == digit)
Console.Write(i +" ");
}
}
}
}
Output
List of combinations of 4 and 8 upto 500:
4 8 44 48 84 88 444 448 484 488
Find Number Combination for any Given Numbers
In the following example, we will find all possible combinations of the given numbers within the given limit.
Example
C# Compiler
using System;
namespace myApp
{
class Program
{
static void Main(string[] args)
{
int i, j, lastDigit, copyNum, digit, count;
int[] num = new int[50];
Console.Write("Enter the number of Combination: ");
int combination = Convert.ToInt32(Console.ReadLine());
for(i=0; i<combination; i++)
{
Console.Write("Enter Digit {0}: ", i+1);
num[i] = Convert.ToInt32(Console.ReadLine());
}
Console.Write("Enter the Limit: ");
int limit = Convert.ToInt32(Console.ReadLine());
// Iterate from 1 to limit
for(i=1; i<=limit; i++)
{
copyNum = i;
count = 0;
digit = 0;
// Check each digit starting from last digit
while(copyNum != 0)
{
count++;
lastDigit = copyNum % 10;
for(j=0; j<combination; j++)
{
if(num[j] == lastDigit)
digit++;
}
copyNum = copyNum / 10;
}
// result
if(count == digit)
Console.Write(i +" ");
}
}
}
}
Output
Enter the number of Combination: 2
Enter Digit 1: 1
Enter Digit 2: 2
Enter the Limit: 500
1 2 11 12 21 22 111 112 121 122 211 212 221 222
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