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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