12. write a C program to determine if the given string is palindrome or not

Program to determine if the given string is palindrome or not

12a) Without buit-in-Functions

Source  Code:

#include<stdio.h>
int main()
{
    char string[40];
    int length=0, flag=1,i;
    printf("Enter string:\n");
    gets(string);
    for(i=0;string[i]!='\0';i++)
    {
        length++;
    }
    for(i=0;i< length/2;i++)
    {
        if( string[i] != string[length-1-i] )
        {
            flag=0;
            break;
        }
    }
    if(flag==1)
    {
        printf("PALINDROME");
    }
    else
    {
        printf("NOT PALINDROME");
    }
    return 0;
}

Output:

Enter String:
madam 
PALINDROME

 12b) With buit-in-Functions

Source  Code:

#include<stdio.h>
#include<string.h>
void main()
{
    char str1[100],str2[100];
    printf("enter the string1 :\n");
    gets(str1);
    str2=strrev(str1);
    if(strcmp(str1,str2)==0)
    {
        printf("Palindrome");  
    }
  else
    printf("Not Palindrome:");
}

Output:

Enter String:
madam 
Palindrome