A very simple program that will ask the user to give a string and then the program will check and determine if the given string is a palindrome or not using pointers in C.
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Sample Program Output
Program Listing
#include <stdio.h>
void stringUpr(char *s);
void stringLwr(char *s);
int main()
{
char string[100];
char *ptr,*rev;
printf("\n\n");
printf("\tPalindrome Program ");
printf("\n\n");
printf("\tGive a String : ");
gets(string);
ptr=string;
stringUpr(ptr);
while(*ptr!=NULL){
++ptr;
}
--ptr;
for(rev=string; ptr>=rev;){
if(*ptr == *rev)
{
--ptr;
rev++;
}
else
break;
}
if(rev>ptr) {
printf("\n\n");
stringUpr(string);
printf("\tThe given string %s is Palindrome.",string);
}
else {
printf("\n\n");
stringUpr(string);
printf("\tThe given string %s is Not a Palindrome.",string);
}
printf("\n\n");
printf("\tEND OF PROGRAM");
printf("\n\n");
}
void stringLwr(char *s)
{
int i=0;
while(s[i]!='\0')
{
if(s[i]>='A' && s[i]<='Z'){
s[i]=s[i]+32;
}
++i;
}
}
void stringUpr(char *s)
{
int i=0;
while(s[i]!='\0')
{
if(s[i]>='a' && s[i]<='z'){
s[i]=s[i]-32;
}
++i;
}
}
