The Program in C that uses a function that calculates factorial of a given number is given below:
#include <stdio.h>
int factorial(int n) {
int result = 1;
for (int i = 1; i <= n; i++) {
result *= i;
}
return result;
}
int main() {
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
printf("The factorial of %d is: %d\n", n, factorial(n));
return 0;
}
Output:
Enter a positive integer: 9
The factorial of 9 is: 362880
Pro-Tips💡
In this program, the factorial() function takes an integer as an argument and uses a for loop to calculate the factorial of that number by iterating from 1 to the given number and multiply each number with the result.
In the main function, the program prompts the user to enter a positive integer and then passes the entered number to the factorial() function, which returns the factorial of the given number.
The program then prints the result on the screen.
The program uses a for loop to calculate the factorial, which is efficient for small numbers, for larger numbers the program may take more time and space.
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