# WAP in C to Calculate Factorial using Pointer!

The Program in C to Calculate Factorial using Pointer is given below:

``````#include <stdio.h>

int factorial(int *n) {
int result = 1;
int temp = *n;
while (*n > 0) {
result *= *n;
(*n)--;
}
*n = temp;
return result;
}

int main() {
int num;
int *p = #

printf("Enter a positive integer: ");
scanf("%d", &num);

int factorial_result = factorial(p);
printf("Factorial of %d = %d\n", num, factorial_result);

return 0;
}
``````

## Output:

Enter a positive integer: 10
Factorial of 10 = 3628800

## Pro-Tips💡

A pointer `'p'` is declared in the main function, and it is assigned the address of the variable ‘`num'`.

The pointer ‘`p'` is then passed as an argument to the `'factorial'` function, where it is used to access and modify the value stored in `'num'`.

The `'factorial'` function uses the dereference operator `'*'` to access the value pointed to by `'p'`,

and it modifies the value stored at the address by decrementing it in each iteration.

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