for循环的一个例子

#include
void main()
{
	int b1,b2,b3,b4,b5;
	int cnt=0;
	printf("\n%5s%5s%5s%5s%5s%5s%7s%7s%11s\n\n",
		"Cnt","b1","b2","b3","b4","b5","fct1","fct2","majority");
	for(b1=0;b1<=1;b1++)
		for(b2=0;b2<=1;b2++)
			for(b3=0;b3<=1;b3++)
				for(b4=0;b4<=1;b4++)
					for(b5=0;b5<=1;b5++)
						printf("%5d%5d%5d%5d%5d%5d%6d%7d%9d\n",
						++cnt,b1,b2,b3,b4,b5,b1||b3||b5,b1&&b2||b4&&b5,
						b1+b2+b3+b4+b5>=3);
	putchar('\n');
	return 0;
}

c语言教程 机械工业出版社 p102