Method 1

#include<stdio.h>
#include<conio.h>
int stpal(char str1[50], char str2[50]);
void main()
{
char str[50], rev[50];
int pal;
clrscr();
printf(“nnt ENTER A STRING…: “);
gets(str);
pal = stpal(str, rev);
printf(“nt THE REVERSED STRING IS…: “);
puts(rev);
if(pal)
printf(“nt THE ENTERED STRING IS A PALINDROME”);
else
printf(“nt THE ENTERED STRING IS NOT A PALINDROME”);
getch();
}
int stpal(char str1[50], char str2[50])
{
int i = 0, len = 0, r = 0, pal = 1;
while(str1[len]!=’′)
len++;
for(i=len-1; i>=0; i–)
{
str2[r] = str1[i];
r++;
}
str2[r] = ‘′;
for(i=0; i<=len-1; i++)
{
if(str1[i] == str2[i])
pal = 1;
else
{
pal = 0;
break;
}
}
return pal;
}

Method 2

#include<stdio.h>
#include<conio.h>
int stpal(char str[50]);
void main()
{
char str[50];
int pal;
clrscr();
printf(“nnt ENTER A STRING…: “);
gets(str);
pal = stpal(str);
if(pal)
printf(“nt THE ENTERED STRING IS A PALINDROME”);
else
printf(“nt THE ENTERED STRING IS NOT A PALINDROME”);
getch();
}
int stpal(char str[50])
{
int i = 0, len = 0, pal = 1;
while(str[len]!=’′)
len++;
len–;
for(i=0; i<len/2; i++)
{
if(str[i] == str[len-i])
pal = 1;
else
{
pal = 0;
break;
}
}
return pal;
}

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Tagged as: C program - To check whether the given string is palindrome, To check whether the given string is palindrome