代码:

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#include<stdio.h>
#include<math.h>
void main()
{
	int siz,i,flage;
	unsigned long int var=0,ifzs=3,mul=2;
	siz=sizeof(unsigned long int);
	printf("unsigned width is %d\n",siz);
	i=siz*8;
	printf("i=%d\n",i);
/*	do
	{
		if(i>1)
			
			printf("%lu:",var);
		else

			printf("%lu:",var-1);
		printf("%d\t",i);
		var*=2;
		--i;
	
	}while(i>0);
*/
	printf("\n2^64=%lu\n",var-1);

	do 
	        {
		mul=2;
		flage=1;	
	
		do{
		      if(ifzs%mul==0)
		      { flage=0;
			      break;}
		      else
		      { ++mul;}
		}while(mul<=sqrt(ifzs));
		if(flage)
		{printf("%lu\t",ifzs);
		        ++ifzs;}
		else
		{	++ifzs;
		}
		}while(ifzs<100);
			printf("\n");
			}

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