5-5.txt

介绍C程设计的一典型案例：例如编写一些小游戏

#include<stdio.h>
int countdigit(int number);
int main(void)
{
	int x,y;
	printf("Enter an integer:");
	scanf("%d",&x);
	y=countdigit(x);
	printf("Number of digit 2:%d\n",y);
	return 0;
}
int countdigit(int number)
{
	int z,m;
	z=0;
	while(number!=0)
	{
		m=number%10;
		number=number/10;
		if(m==2)
			z++;
	}
	return z;
}