Program 18

 Program 18

Write a function called first_diff that is given two strings and returns the first location in which the strings differ. If the strings are identical, it should return -1.

def first_diff(s1,s2):

    if(s1==s2):

        return(-1)

    else:

        if len(s1)==len(s2):

            for i in range(len(s2)):

                if s1[i]!=s2[i]:

                    return(i+1)

s1=input("Enter the string1:")

s2=input("Enter the string2:")

c=first_diff(s1,s2)

if(c==-1):

    print("Both Strings are Identical")

else:

    print("first Difference occurs at location: ",c)

OUTPUT:

========= RESTART: D:\old\r19 lab-python\18.py ================

Enter the string1:crr

Enter the string2:crr

Both Strings are Identical

>>> 

============ RESTART: D:\old\r19 lab-python\18.py =============

Enter the string1:crrcoe

Enter the string2:crrcse

first Difference occurs at location: 5

>>>