Palindrome Program in C with Functions and Pointers
Introduction
In this blog post, we will analyze the notion of palindromes and explore how to write a C program to check whether a given string is a palindrome using functions and pointers. Palindromes are the words which can be spelled from both ends. In this article, we will look into the palindrome checking algorithm, give stepwise details on how it works, provide examples of C code with functions and pointers, as well as check outputs.
Understanding Palindromes
A palindrome is a word or sequence that reads the same backward as forward. They can be numbers, words, or phrases. As an example: radar is one such word. Level again is another one. Civic is a third example. This explains why words are called palindromic.
Algorithm for Palindrome Checking Using Functions and Pointers
The procedure for checking if a string is a palindrome in C using functions and pointers includes two pointers that traverse through the string beginning at either end. To ensure better modularity, we apply functions encapsulating our logic of checking if it’s a palindrome. Here are its steps:
- Input: The strings that you want to test for palindromicity.
- Initialization: Two pointers are initialized with one pointing at the start while another one towards the end of the string being examined.
- Comparison: Compare letters at those addresses. If they are the same, move them towards one another. If not, then it is not a palindrome.
- Comparison and pointer movement are repeated until the pointers meet at the center.
- Case Palindrome Check: The input is a palindrome when the pointers meet each other; otherwise, it is not so.
king algorithm in a C program using functions and pointers.
#include <stdio.h>
#include <string.h>
// Function to check if a given string is a palindrome
int isPalindrome(char *str) {
char *start = str;
char *end = str + strlen(str) - 1;
// Check for palindrome
while (start < end) {
if (*start != *end) {
return 0; // Not a palindrome
}
start++;
end--;
}
return 1; // Palindrome
}
int main() {
char inputString[100];
printf("Enter a string: ");
scanf("%s", inputString);
if (isPalindrome(inputString)) {
printf("%s is a palindrome.\n", inputString);
} else {
printf("%s is not a palindrome.\n", inputString);
}
return 0;
}
Output Example
Example: Palindrome String Using Functions and Pointers
Enter a string: madam
madam is a palindrome.
Explanation
The present program defines a function isPalindrome that tests whether a given string is a palindrome. It can be passed to varying strings because the function uses a pointer to the string as an argument. The pointers start and end are used for traversing through the string from both ends. Comparisons are made until two pointers meet in the middle.
Conclusion
In C programming, functions and pointers provide modularity and flexibility to code. In terms of palindrome checking, this helps us to make our code cleaner and more maintainable by allowing us to put our palindrome logic within a function.
You may play around with the given C code in your C-development environment. Do not hesitate to ask if you have any inquiries, runtime issues or wish to learn more about palindromes, C programming or use of functions and pointers!