Thread: host byte order program not running

hello everyone, i m writing a c program to find the host byte error but it is not executing....cud any1 plz plz plz help me out in sorting this out.
thanks a lot in advance

Code:

#include<stdio.h>

int main()
{
int a,i;
char b[sizeof(a)];

printf("enter b");
for(i=0;i<sizeof(a);i++)
{
scanf("%c",&b[i]);
}

if(sizeof(a)==4)
{
	if(b[1]==1 && b[2]==2 && b[3]==3 && b[4]==4)
	{
		printf("big endian");
	}
	else if(b[1]==4 && b[2]==3 && b[3]==2 && b[1]==1)
	{
		printf("little endian");
	}
}
else
	{
		printf("invalid");
	}
}