2-6.c

c实现的常用几个算法

#include<stdio.h>
void main(void)
{ 
	char c;
	int alpha,digit,other;	
	alpha=digit=other=0;
	printf("input a text end of newline:\n");
	while((c=getchar())!='\n')
		if(c>='a'&&c<='z'||c>='A'&&c<='Z')
			alpha++;
		else if (c>='0'&&c<='9')
			digit++;
		else
			other++;
	printf("alphas=%d\ndigits=%d\nother=%d\n",alpha,digit,other);
}