FOR NUMBERS:
#include<stdio.h>
#include<conio.h>
void main()
{
int n,s=0,m;
clrscr();
printf("enter any no");
scanf("%d",&n);
m=n;
while(n>0)
{
r=n%10;
s=s*10+r;
n=n/10;
}
if(m==n)
printf("the no is palindrome");
else
printf("no is not palindrome");
getch();
}
FOR STRINGS:
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char a[100], b[100];
printf("Enter the string to check if it is a palindrome\n");
gets(a);
strcpy(b,a);
strrev(b);
if( strcmp(a,b) == 0 )
printf("Entered string is a palindrome.\n");
else
printf("Entered string is not a pailndrome.\n");
getch();
return 0;
}
USING DATA STRUCTURES:
#include<stdio.h>
int is_palindrome(char*);
void copy_string(char*, char*);
void reverse_string(char*);
int string_length(char*);
int compare_string(char*, char*);
main()
{
char string[100];
int result;
printf("Enter a string\n");
gets(string);
result = is_palindrome(string);
if ( result == 1 )
printf("\"%s\" is a palindrome string.\n", string);
else
printf("\"%s\" is not a palindrome string.\n", string);
return 0;
}
int is_palindrome(char *string)
{
int check, length;
char *reverse;
length = string_length(string);
reverse = (char*)malloc(length+1);
copy_string(reverse, string);
reverse_string(reverse);
check = compare_string(string, reverse);
free(reverse);
if ( check == 0 )
return 1;
else
return 0;
}
int string_length(char *string)
{
int length = 0;
while(*string)
{
length++;
string++;
}
return length;
}
void copy_string(char *target, char *source)
{
while(*source)
{
*target = *source;
source++;
target++;
}
*target = '\0';
}
void reverse_string(char *string)
{
int length, c;
char *begin, *end, temp;
length = string_length(string);
begin = string;
end = string;
for ( c = 0 ; c < ( length - 1 ) ; c++ )
end++;
for ( c = 0 ; c < length/2 ; c++ )
{
temp = *end;
*end = *begin;
*begin = temp;
begin++;
end--;
}
}
int compare_string(char *first, char *second)
{
while(*first)
{
if (*first == *second)
{
first++;
second++;
}
else
return -1;
}
return 0;
}
USING C++:
#include<iostream.h>
#include<string.h>
int main()
{
char str[25],str1[25];
cout<<"Enter a string: ";
gets(str);
strcpy(str1,str);
strrev(str);
if(strcmp(str,str1)!=0)
{
cout<<"string is not palindrome";
}
else
{
cout<<"string is a palindrome";
}
cout<<endl;
USING JAVA:
String s1=args[0];
String s2="";
for(int i=0; i<s1.length(); i++)
{
s2=s2+charAt(i);
}
if(s1.equals(s2))
System.out.println("Palindrome");
else
System.out.println("Not Palindrome");
