Python Program to Find the First Occurrence of a Character in a Given String

# Python Program to find First Occurrence of a Character in a given String Using For Loop

# Take the Input From the User
string = input("Enter The String: ")
char = input("Enter a Character to Check its First Occurrence: ")

# make string to lower to avoid case-sensitiveness of a character
string=string.lower()

flag = 0
for i in range(len(string)):
    if(string[i] == char):
        flag = 1
        break

if(flag == 0):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The first Occurrence of ", char, " is Found at Position " , i + 1)

Enter The String: Tutorials Rack is an Online Learning Website

Enter a Character to Check its First Occurrence: i

The first Occurrence of  i  is Found at Position  6

# Python Program to find First Occurrence of a Character in a given String Using While Loop

# Take the Input From the User
string = input("Enter The String: ")
char = input("Enter a Character to Check its First Occurrence: ")

# make string to lower to avoid case-sensitiveness of a character
string=string.lower()

i = 0
flag = 0

while(i < len(string)):
    if(string[i] == char):
        flag = 1
        break
    i = i + 1

if(flag == 0):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The first Occurrence of ", char, " is Found at Position " , i + 1)

Enter The String: Tutorials Rack is an Online Learning Website

Enter a Character to Check its First Occurrence: a

The first Occurrence of  a  is Found at Position  7

# Python Program to find First Occurrence of a Character in a given String By Defining a function

def first_Occurrence_char(char, string):
    # make string to lower to avoid case-sensitiveness of a character
    string = string.lower()
    for i in range(len(string)):
        if(string[i] == char):
            return i
    return -1

# Take the Input From the User
string = input("Enter The String: ")
char = input("Enter a Character to Check its Last Occurrence: ")

flag =  first_Occurrence_char(ch, str1)
if(flag == -1):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The first Occurrence of ", ch, " is Found at Position " , flag + 1)

Enter The String: Tutorials Rack is an Online Learning Website

Enter a Character to Check its Last Occurrence: r

The first Occurrence of  r  is Found at Position  5