In this article we will try to implement a C program to find a string is palindrome or not. A C program is provided below to check if the given string is a palindrome or not.
The program is:
/*
* C program to implement the following string functions using user defined functions:
* i. Length of a string
* ii. Find whether the given string is a palindrome or not
* Author: P.S.SuryaTeja
*/
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
void length(char *str)
{
int count = 0;
while(*str != '\0')
{
count++;
str++;
}
printf("\nLength of the string is: %d", count);
}
void ispalindrome(char *str)
{
char *revstr, *startstr;
int stringlength = strlen(str);
int i, flag = 0;
startstr = str;
for(i = 0; i < stringlength - 1; i++)
str++;
revstr = str;
while(startstr < revstr)
{
if(*startstr != *revstr)
flag = 1;
startstr++;
revstr--;
}
if(flag == 0)
printf("\nEntered string is a palindrome");
else
printf("\nEntered string is not a palindrome");
}
int main(int argc, char **argv)
{
char str[20];
printf("Enter a string: ");
gets(str);
printf("\n");
length(str);
printf("\n");
ispalindrome(str);
getch();
return 0;
}
Input and output for the above program is as follows:
Enter a string: madam
Length of the string is: 5
Entered string is a palindrome
Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.
He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.
He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.
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