Program to check whether a string is palindrome or not?

void main()
{
char str[40];
int i,flag=0,len;
clrscr();
printf("\n Enter A string : ");
gets(str);
len=strlen(str);
for(i=0;i<(len/2);i++)

{

if(str[i]!=str[len-1-i])

{

flag=1;

break;

}

}

if(flag==1)

{

printf(" \n The string is not palindrome");

}

if(flag==0)

printf("\n String is palindrome");

getch();

}