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Full Code:
Code Explanation :
You should have the knowledge of following topics of C programming:
The factorial of number n(input given by user) is given by:
factorial of n (n!) = 1 * 2 * 3 * 4....n
The factorial of a negative number doesn't exist. And, the factorial of 0 is 1.
In this program, we are taking positive integer as input from user and calculate the factorial using for loop.
Since a number's factorial might be very high, the form of factorial variable is declared unsigned long.
The program prints error id user give positive integer.
Algorithm
Step 1 : start
Step 2 : Declare variables n, i, fact
Step 2 : Initialize fact = 1
Step 3 : Read n
Step 4 : IF n < 0 THEN
Print Error! Factorial of a negative number doesn't exist.
goto step 7
ELSE
goto step 5
Step 5 : Repeat this process until i < n
5.1 : fact *= i
Step 6 : Display fact
Step 7 : end
Flowchart
Our example mainly covers following topics in any programing
- Basic Programs
- Number Programs
- Array Programs
- Matrix Programs
- Pattern Programs
- String Programs
- Tree Programs
- Singly Linked List Programs
- Circular Linked List Programs
- Doubly Linked List Programs
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