OJ Board

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Thanx ,,got AC

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AbBa

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You won't be eaten!

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<cctype>
#include<cstdio>
#include<cstring>


int main()
{
	char s[1000000];
	int init,end;
	bool des;
	while(gets(s)&& strcmp(s,"DONE"))
	{
		des=false;
		init=0;
		end=strlen(s)-1;
	
	while(init<=end)
		{
			if(!strcmp(s," "))
			break;
			while(init<=end && (s[init]<65 ||(s[init]>90 && s[init]<97)||s[init]>122))
				init++;
			while(end>=init && (s[end]<65 ||(s[end]>90 && s[end]<97)||s[end]>122))
				end--;
			if(s[init]>96)
				s[init]-=32;
			if(s[end]>96)
				s[end]-=32;
			if(s[init]!=s[end])
			{
				des=true;
				break;
		
			}
			init++;
			end--;
			while(init<=end && (s[init]<65 ||(s[init]>90 && s[init]<97)||s[init]>122))
				init++;
			while(end>=init && (s[end]<65 ||(s[end]>90 && s[end]<97)||s[end]>122))
				end--;
		}
		if(des)
			printf("Uh oh..\n");
		else
			printf("You won't be eaten!\n");

		memset(s,0,sizeof(s));
	}
	return 0;
}

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thanks! brianfry713.I got accepted. I finally know that Null is very important for string.

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#include <ctype.h>
char* strlower( char* s )
{
  char* p = s;
  while (*p = tolower( *p )) p++;
  return s;
}

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Removed after AC!!! 
For other: DON'T USE strrev();

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#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define MAX 1000

int main(void){
	char palindrome[MAX + 1] = {0};
	int len, i, j, alpha;

	while(fgets(palindrome, MAX, stdin)){
		alpha = 0;

		len = strlen(palindrome);
		if(palindrome[len - 1] == '\n')
			palindrome[len - 1] = '\0';
		len = strlen(palindrome);
		
		if(strcmp(palindrome, "DONE") == 0)
			break;
		
		for(i = 0; i < len; i++)
			if(isalpha(palindrome[i]))
				alpha++;

		for(i = 0, j = len - 1; i < alpha/2; i++, j--){
			if(isspace(palindrome[i]) || ispunct(palindrome[i]))
				++i;

			if(isspace(palindrome[j]) || ispunct(palindrome[j]))
				--j;
			
			if(toupper(palindrome[i]) != toupper(palindrome[j])){
				printf("Uh oh..\n");
				break;
			}
		}
			
		if(i == alpha/2)
			printf("You won't be eaten!\n");
	
	}
	return 0;
}

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M..a..d..a..m, Im adam!
DONE

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You won't be eaten!