Palindrome Program In C

Palindrome is a word , number that can  be read same front direction and opposite direction.


Example :

• Palindrome  words (Strings ) 

1. Racecar
2. Madam
3. Level
4. Radar
5. Toot
6. Pop

• Palindrome numbers

1. 121
2. 1221
3. 141
4. 1234321
5. 676

1.To Check whether Given String Is Palindrome or Not  :


Program :

#include<stdio.h>
#include<conio.h>
int pali( char []);
void main()
{
    char ch;
    do{
        int n;
        char s[20];
        clrscr();
        printf("\n Enter the string:");
        gets(s);
        n=pali(s);

        if(n==1)

            printf("\n <%s> is palindrome \n",s);
        else

            printf("\n <%s> not palindrome \n",s);
    printf("Continue(y/n):");
    ch=getch();
    }while(ch=='y'||ch=='Y');
}
int pali(char s[])
{
    int r,n=1,l=0;
    char toupper(char);

       for(r=0;s[r]!='\0';r++);

       r=r-1;
       while(l<r)
       {
        if(toupper (s[l])!=toupper(s[r]))
        {
            n=0;
            break;
        }
           l++;
           r--;

       }
       return n;

}
char toupper(char c)
{
    if(c>='a' &&  c<='z')
    c=c-32;
    return c;
}

Note : Madam ,First letter  M is a Capital and Last letter  m is a small letter . There ASCII value  is deference  M = 77 and m= 109 . Toupper function works that small m letter convert to capital M letter 109-32=77.


Output :

2.To Check whether Given Number Is Palindrome or Not  :


Program :

#include<stdio.h>
#include<conio.h>
void main()
{

int a,b,c=0,r=0;


    clrscr();
    printf("\t Enter any no :");
    scanf("%d",&a);
    b=a;
while(a>0)
{
r=a%10;
c=c*10+r;
a=a/10;
}
    if(c==b)
        printf("\t <%d> the no is palindrome",b);
    else
        printf("\t <%d> is not palindrome",b);
        
getch();

}

Output :

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