infinite loop problem

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C

i compiled the following program in ubuntu 10.04, but it went into an infinite loop.
please help me find the problem.
and also tell what EOF is..

#include<stdio.h>
void main()
{
	int nwords[20];
	int count=0, i, c;
	for(i=0;i<20;i++)
	{
		nwords[i]=0;
	}
	while((c=getchar())!='\n')
	{
		while((c!=' ')||(c!='\t'))
		{
			nwords[count]++;
			c=getchar();
		}
		count++;
	}
	for(i=0;i<20;i++)
	{
		printf("word no. %d : %d letters", (i+1), nwords[i]);
	}
}