C Program to Calculate and Print the Value of Npr

In this example, we are calculating the value of nPr based on the given values of n and r.

Calculate the Value of nPr In C Programming

	
#include <stdio.h>
int fact(int);
void main()
{
    int n, r, npr_var;
    
    printf("Enter the value of n:");
    scanf("%d", &n);
    printf("\nEnter the value of r:");
    scanf("%d", &r);
    
    npr_var = fact(n) / fact(n - r);
    printf("\nThe value of P(%d,%d) is: %d",n,r,npr_var);
}
int fact(int num)
{
    int k = 1, i;
    if (num == 0)
    {
        return(k);
    }
    else
    {
        for (i = 1; i <= num; i++)
        {
                k = k * i;
        }
    }
    return(k);
}
    

Output :

	
Enter the value of n:5
Enter the value of r:2
The value of P(5,2) is: 20