This C Program calculates the value of nPr. Here we need find all possible rearrangement of the element i.e all the possible permutation value. A permutation is a re-arrangement of elements of a set. Any duplications of the collected elements in different orders is allowed. A permutation therefore tends to be a large number.

Here is source code of the C program to calculate the Value of nPr. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C program to Calculate the Value of nPr`

`*/`

`#include <stdio.h>`

void main(void)

`{`

printf("%d\n", fact(8));

int n, r;

printf("Enter value for n and r\n");

scanf("%d%d", &n, &r);

int npr = fact(n) / fact(n - r);

printf("\n Permutation values is = %d", npr);

`}`

int fact(int x)

`{`

if (x <= 1)

return 1;

return x * fact(x - 1);

`}`

Output: $ cc pgm13.c $ a.out 40320 Enter value for n and r 5 4 Permutation values is = 120

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If you wish to look at other example programs on Mathematical Functions, go to C Programming Examples on Mathematical Functions. If you wish to look at programming examples on all topics, go to C Programming Examples.