统计输入字符

#include<stdio.h>
void main()
{
    char ch;
    int a=0,b=0,c=0,d=0;   /* a为数字个数，b为空格个数，c为字符个数，d为其他个数*/
    while(ch=getchar()!='\n')
    {
        if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
        {
            c++;
        }
        else if(ch>='0'&&ch<='9')
        {
            a++;
        }
        else if(ch==' ')
        {
            b++;
        }
        else
        {
            d++;
        }
    }
        printf("数字个数为%d,空格个数为%d,字符个数%d,其他个数%d",a,b,c,d);
   
}