Factorial in C

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Q. Write a C program for Factorial Number.

#include <iostream>  
void main(){
    int n, i;
    unsigned long factorial = 1;
    printf("Enter the factorial number : ");
    scanf("%d",&n);
     factorial= fact(n);
        printf("Factorial of %d = %d", n, factorial);
}
int fact(int a){  
    if (a==0 || a==1){  
        return 1;  
    }  
    else{  
        return a*fact(a-1);  
    }  
}
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Q. Write an algorithm to Factorial Number in C.

Step 1: Start the program.
Step 2: Declare variables:
      - `n` (integer) to store the input number.
      - `factorial` (unsigned long) to store the factorial result.
Step 3: Prompt the user to enter an integer number `n`.
Step 4: Read the input number from the user.
Step 5: Define a recursive function `fact(int a)` that returns factorial of `a`:
      - If `a` is 0 or 1, return 1. (Base case)
      - Otherwise, return `a * fact(a - 1)` (Recursive call).
Step 6: Call the function `fact(n)` and assign the returned value to `factorial`.
Step 7: Print the result: "Factorial of n = factorial".
Step 8: End the program.
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