Factorial calculation of a number using the pointer in C
In this tutorial, we will discuss the concept of Factorial calculation of a number using the pointer in C programming language
In this post, we will learn how to calculate factorial of a number using the pointer in C language and go through the given C example to calculate the factorial of a given positive integer
What is factorial
Factorial is a product of all positive descending integer begins with a specified number (n) and calculates up to one
Example
factorial of 5 is
5!=5*4*3*2*1=120
factorial of 4 is
4!=4*3*2*1=24
factorial of n is
n!=n*(n-1)*....2*1
Example
Program 1
The program allows the user to enter a number (a positive integer) and then it calculates factorial of given number using pointer variable in C programming language
//C program find factorial of given number in C
#include <stdio.h>
#include <stdlib.h>
void findFactorial(int, int *);//Function prototype
int main()
{
int i,fact,num;
printf("Enter a number: \n");
scanf("%d",&num);//Takes input from the user
findFactorial(num, &fact);//function call
printf("Factorial of %d is: %d",num,fact);
//display the factorial of given number
getch();
return 0;
}
void findFactorial(int num, int *fact){//function definition
int i;
*fact=1;
for(i=1; i<=num; i++){//find factorial using for loop
*fact=*fact*i;
}
}
When the above code is executed, it produces the following results
Enter a number 6 Factorial of 6 is : 720
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