Python Function Recursion 2

Question:2
Python script to calculate factorial of a no (Method:2)
Sol:

def fact(n):
    if(n<0):
        return(-1)
    if(n==0):
        return(1)
    else:
        return(n*fact(n-1))


#function calling
while True:
    a=int(input("Enter any no "))
    b=fact(a)
    if(b==-1):
        print("-ve nos not allowed")
    else:
        print("Fact = ",b)
    ch=input("Like to cont ")
    if(ch=='y' or ch=='Y'):
        continue
    else:
        break

Output:

Enter any no 5
Fact = 120
Like to cont y
Enter any no 6
Fact = 720
Like to cont y
Enter any no 4
Fact = 24
Like to cont y
Enter any no 3
Fact = 6
Like to cont n
>>>

Question:3
Python script to calculate the sum of first “n” numbers
Sol:

def sum(n):
    s=0
    if(n==0):
        return(s)
    else:
        return(n+sum(n-1))
    

#function calling
    
while True:
    a=int(input("Enter the limit "))
    s=sum(a)
    print("Sum = ",s)
    ch=input("Like to cont .... (y/n) ")
    if(ch=='y' or ch=='Y'):
        continue
    else:
        break

Output:

Enter the limit 5
Sum = 15
Like to cont …. (y/n) y
Enter the limit 10
Sum = 55
Like to cont …. (y/n) y
Enter the limit 20
Sum = 210
Like to cont …. (y/n) n
>>>

Question:4
Python script to calculate product of first “n” numbers
Sol:

def prod(n):
    p=1
    if(n==0):
        return(p)
    else:
        return(n*prod(n-1))
    

#function calling
    
while True:
    a=int(input("Enter the limit "))
    p=prod(a)
    print("Prod = ",p)
    ch=input("Like to cont .... (y/n) ")
    if(ch=='y' or ch=='Y'):
        continue
    else:
        break

Output:

Enter the limit 3
Prod = 6
Like to cont …. (y/n) y
Enter the limit 5
Prod = 120
Like to cont …. (y/n) y
Enter the limit 6
Prod = 720
Like to cont …. (y/n) y
Enter the limit 4
Prod = 24
Like to cont …. (y/n) n
>>>

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