L 47: Palindrome String & Find Length Without Using Predefined Functions in C | Practical Tutorial
Description: Welcome to Carrier With Code (CWC) 💻🚀
In this lecture, we will learn two important String Programs in C Programming Language.
First, we will write a program to check whether a string is a Palindrome or not. Then, we will write another program to find the length of a string without using the predefined strlen() function.
We will understand the complete logic, syntax, working, and output of both programs with simple explanations.
This lecture is designed for beginners, BCA students, and students preparing for C programming practicals and semester examinations.
📚 Topics Covered
✅ Introduction to Palindrome String
✅ What is a Palindrome String?
✅ Program to Check Palindrome String
✅ Palindrome String Using Logic
✅ Comparing Characters from Both Ends
✅ Introduction to String Length
✅ Finding String Length Without strlen()
✅ Using for Loop to Count Characters
✅ Complete C Programs
✅ Program Explanation Step by Step
✅ Practical Examples and Outputs
✅ Difference Between Predefined and User-Defined Logic
1️⃣ Introduction to Palindrome String in C
What is a Palindrome String?
A Palindrome String is a string that remains the same when its characters are reversed.
In simple words, if the original string and its reverse are the same, it is called a Palindrome String.
Examples
Original String
Reverse String
Result
MADAM
MADAM
Palindrome
LEVEL
LEVEL
Palindrome
HELLO
OLLEH
Not Palindrome
RADAR
RADAR
Palindrome
Important Points
A palindrome string reads the same from left to right and right to left.
We can check a palindrome using loops.
We can compare characters from both ends of the string.
In this program, we will use logic instead of a predefined reverse function.
2️⃣ Program to Check Palindrome String in C
Logic Behind Palindrome String
Declare a character array to store the string.
Take a string as input from the user.
Find the length of the string using a loop.
Compare the first and last characters.
Move towards the middle of the string.
If all corresponding characters match, the string is a palindrome.
Otherwise, it is not a palindrome.
Output 2
Enter a string: HELLO
The string is Not Palindrome.
3️⃣ Introduction to String Length Without Predefined Function
What is String Length?
String length means the total number of characters present in a string.
In C, the strlen() function is normally used to count string length. But we can also calculate the length without using any predefined function.
Example
String: PROGRAM
Total Characters: 7
Important: The null character (\0) is not included in the string length.
4️⃣ Program to Find Length of a String Without Using strlen()
Logic Behind String Length
Declare a character array.
Take a string as input from the user.
Initialize a variable length with 0.
Use a while loop to check each character.
Increase the length by 1 for every character.
Stop when the null character (\0) is found.
Display the total length.
Explanation
char str[100] creates a character array.
length = 0 initializes the counter.
The while loop checks each character of the string.
str[length] accesses the current character.
length++ increases the count by one.
The loop stops when \0 is found.
Finally, the program displays the total length.
5️⃣ Understanding String Length Using Loop
Suppose the input string is:
HELLO
Character
H
E
L
L
O
\0
Index
0
1
2
3
4
5
The loop counts the characters one by one.
Character Checked
Length
H
1
E
2
L
3
L
4
O
5
\0
Loop stops
Final Length = 5
📚 This Lecture Is Perfect For
🎓 BCA Students
💻 C Programming Beginners
📖 BSc Computer Science Students
📝 College Practical Exams
🚀 Students Learning String Handling in C
🎯 Students Preparing for Semester Exams
🔍 SEO Keywords
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#️⃣ Hashtags
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#CWC Close description
In this lecture, we will learn two important String Programs in C Programming Language.
First, we will write a program to check whether a string is a Palindrome or not. Then, we will write another program to find the length of a string without using the predefined strlen() function.
We will understand the complete logic, syntax, working, and output of both programs with simple explanations.
This lecture is designed for beginners, BCA students, and students preparing for C programming practicals and semester examinations.
📚 Topics Covered
✅ Introduction to Palindrome String
✅ What is a Palindrome String?
✅ Program to Check Palindrome String
✅ Palindrome String Using Logic
✅ Comparing Characters from Both Ends
✅ Introduction to String Length
✅ Finding String Length Without strlen()
✅ Using for Loop to Count Characters
✅ Complete C Programs
✅ Program Explanation Step by Step
✅ Practical Examples and Outputs
✅ Difference Between Predefined and User-Defined Logic
1️⃣ Introduction to Palindrome String in C
What is a Palindrome String?
A Palindrome String is a string that remains the same when its characters are reversed.
In simple words, if the original string and its reverse are the same, it is called a Palindrome String.
Examples
Original String
Reverse String
Result
MADAM
MADAM
Palindrome
LEVEL
LEVEL
Palindrome
HELLO
OLLEH
Not Palindrome
RADAR
RADAR
Palindrome
Important Points
A palindrome string reads the same from left to right and right to left.
We can check a palindrome using loops.
We can compare characters from both ends of the string.
In this program, we will use logic instead of a predefined reverse function.
2️⃣ Program to Check Palindrome String in C
Logic Behind Palindrome String
Declare a character array to store the string.
Take a string as input from the user.
Find the length of the string using a loop.
Compare the first and last characters.
Move towards the middle of the string.
If all corresponding characters match, the string is a palindrome.
Otherwise, it is not a palindrome.
Output 2
Enter a string: HELLO
The string is Not Palindrome.
3️⃣ Introduction to String Length Without Predefined Function
What is String Length?
String length means the total number of characters present in a string.
In C, the strlen() function is normally used to count string length. But we can also calculate the length without using any predefined function.
Example
String: PROGRAM
Total Characters: 7
Important: The null character (\0) is not included in the string length.
4️⃣ Program to Find Length of a String Without Using strlen()
Logic Behind String Length
Declare a character array.
Take a string as input from the user.
Initialize a variable length with 0.
Use a while loop to check each character.
Increase the length by 1 for every character.
Stop when the null character (\0) is found.
Display the total length.
Explanation
char str[100] creates a character array.
length = 0 initializes the counter.
The while loop checks each character of the string.
str[length] accesses the current character.
length++ increases the count by one.
The loop stops when \0 is found.
Finally, the program displays the total length.
5️⃣ Understanding String Length Using Loop
Suppose the input string is:
HELLO
Character
H
E
L
L
O
\0
Index
0
1
2
3
4
5
The loop counts the characters one by one.
Character Checked
Length
H
1
E
2
L
3
L
4
O
5
\0
Loop stops
Final Length = 5
📚 This Lecture Is Perfect For
🎓 BCA Students
💻 C Programming Beginners
📖 BSc Computer Science Students
📝 College Practical Exams
🚀 Students Learning String Handling in C
🎯 Students Preparing for Semester Exams
🔍 SEO Keywords
palindrome string program in C
palindrome program in C language
check palindrome string in C
string length without strlen in C
find length of string without predefined function
C programming string programs
palindrome string using loop in C
string length using while loop in C
C programming without built in functions
string handling in C language
C programming practical programs
C programming tutorial in Hindi
C programming for BCA students
Carrier With Code
#️⃣ Hashtags
#CProgramming
#PalindromeString
#StringLength
#StringPrograms
#WithoutStrlen
#WithoutBuiltInFunction
#StringHandling
#CLanguage
#CProgrammingInHindi
#CProgrammingForBeginners
#BCA
#BCACourse
#Programming
#Coding
#CarrierWithCode
#CWC Close description
