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Write a C# program to calculate a factorial using recursion
Factorial of a number is what we are finding using a recursive function checkFact () in the below example −
If the value is 1, it returns 1 since Factorial is 1 −
if (n == 1) return 1;
If not, then the recursive function will be called for the following iterations if you want the value of 5!
Interation1: 5 * checkFact (5 - 1); Interation2: 4 * checkFact (4 - 1); Interation3: 3 * checkFact (3 - 1); Interation4: 4 * checkFact (2 - 1);
To calculate a factorial using recursion, you can try to run the following code which shows what is done above −
Example
using System;
namespace Demo {
class Factorial {
public int checkFact(int n) {
if (n == 1)
return 1;
else
return n * checkFact(n - 1);
}
static void Main(string[] args) {
int value = 9;
int ret;
Factorial fact = new Factorial();
ret = fact.checkFact(value);
Console.WriteLine("Value is : {0}", ret );
Console.ReadLine();
}
}
}Output
Value is : 362880
Updated on: 20-Jun-2020
2K+ Views
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