C语言简单编程题

 1. 打印100~200之间的素数

#define  _CRT_SECURE_NO_WARNINGS 1
#include 

int data = 0;
//用这个函数来判断一个数是否为素数
bool prime_number_detect(unsigned char num)
{
	unsigned char i;
	for (i = 2; i < num - 1; i++)
	{
		if (num % i)
		{
			
		}
		else//结果为0，不是素数
		{
			return false;
			
		}
		
	}
	printf("%dn", num);
	data += num;

}

int main(void)
{
	unsigned char num = 100;
	for (num = 100; num < 201; num++)
	{
	prime_number_detect(num);
	}
	if (data == 3167)
	{
	printf("素数和正确 = %dn",data);
	}
	

}

2. 输出乘法口诀表 

#define  _CRT_SECURE_NO_WARNINGS 1
#include 


int main()
{
	unsigned char i, j;
	unsigned char product;
	for (i = 1;i < 10; i++)
	{
		for (j = 1; j < 10; j++)
		{
			printf("%d * %d = ",i,j);
			product = i * j;
			printf("%dn",product);
				
		}
	}
}