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C# factorial
To calculate factorial in C#, you can use while loop and loop through until the number is not equal to 1.
Here n is the value for which you want the factorial −
int res = 1;
while (n != 1) {
res = res * n;
n = n - 1;
}Above, let’s say we want 5! (5 factorial)
For that, n=5,
Loop Iteration 1 −
n=5 res = res*n i.e res =5;
Loop Iteration 2 −
n=4 res = res*n i.e. res = 5*4 = 20
Loop Iteration 3 −
n=3 res = res*n i.e. res = 20*3 = 60
Example
In this way, all the iterations will give the result as 120 for 5! as shown in the following example.
using System;
namespace MyApplication {
class Factorial {
public int display(int n) {
int res = 1;
while (n != 1) {
res = res * n;
n = n - 1;
}
return res;
}
static void Main(string[] args) {
int value = 5;
int ret;
Factorial fact = new Factorial();
ret = fact.display(value);
Console.WriteLine("Value is : {0}", ret );
Console.ReadLine();
}
}
}Output
Value is : 120
Updated on: 19-Jun-2020
2K+ Views
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